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Agnosticism is the view that, the truth values of certain claims – especially metaphysical and religious claims such as whether God, the divine or the supernatural exist – are unknown and perhaps unknowable.
According to the philosopher William L. Rowe: "In the popular sense of the term, an agnostic is someone who neither believes nor disbelieves in God, whereas an atheist disbelieves in God."  Agnosticism is a doctrine or set of tenets rather than a religion as such.
Thomas Henry Huxley, an English biologist, coined the word "agnostic" in 1869. Earlier thinkers, however, had written works that promoted agnostic points of view, such as Sanjaya Belatthaputta, a 5th-century BCE Indian philosopher who expressed agnosticism about any afterlife; and Protagoras, a 5th-century BCE Greek philosopher who expressed agnosticism about "the gods". The Nasadiya Sukta in the Rigveda is agnostic about the origin of the universe.
- 1 Defining agnosticism
- 2 History
- 3 Demographics
- 4 Criticism
- 5 Related concepts
- 6 See also
- 7 References
- 8 External links
Agnosticism is of the essence of science, whether ancient or modern. It simply means that a man shall not say he knows or believes that which he has no scientific grounds for professing to know or believe. Consequently Agnosticism puts aside not only the greater part of popular theology, but also the greater part of anti-theology. On the whole, the "bosh" of heterodoxy is more offensive to me than that of orthodoxy, because heterodoxy professes to be guided by reason and science, and orthodoxy does not.— Thomas Henry Huxley
That which Agnostics deny and repudiate, as immoral, is the contrary doctrine, that there are propositions which men ought to believe, without logically satisfactory evidence; and that reprobation ought to attach to the profession of disbelief in such inadequately supported propositions.— Thomas Henry Huxley
Agnosticism, in fact, is not a creed, but a method, the essence of which lies in the rigorous application of a single principle ... Positively the principle may be expressed: In matters of the intellect, follow your reason as far as it will take you, without regard to any other consideration. And negatively: In matters of the intellect do not pretend that conclusions are certain which are not demonstrated or demonstrable.— Thomas Henry Huxley
Being a scientist, above all else, Huxley presented agnosticism as a form of demarcation. A hypothesis with no supporting objective, testable, evidence is not an objective, scientific, claim. As such, there would be no way to test said hypotheses, leaving the results inconclusive. His agnosticism was not compatible with forming a belief as to the truth, or falsehood, of the claim at hand. Karl Popper would also describe himself as an agnostic. According to philosopher William L. Rowe, in this strict sense, agnosticism is the view that human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does not exist.
Others have redefined this concept, making it compatible with forming a belief, and only incompatible with absolute certainty. George H. Smith, while admitting that the narrow definition of atheist was the common usage definition of that word, and admitting that the broad definition of agnostic was the common usage definition of that word, promoted broadening the definition of atheist and narrowing the definition of agnostic. Smith rejects agnosticism as a third alternative to theism and atheism and promotes terms such as agnostic atheism (the view of those who do not believe in the existence of any deity, but do not claim to know if a deity does or does not exist) and agnostic theism (the view of those who do not claim to know of the existence of any deity, but still believe in such an existence).
Smith's terminology hadn't caught on by the time Antony Flew came along, also promoting a broader definition of atheism, and also bringing into question the definition of agnosticism.
In this interpretation an atheist becomes: not someone who positively asserts the non-existence of God; but someone who is simply not a theist. Let us, for future ready reference, introduce the labels 'positive atheist' for the former and 'negative atheist' for the latter. The introduction of this new interpretation of the word 'atheism' may appear to be a piece of perverse Humpty-Dumptyism, going arbitrarily against established common usage. 'Whyever', it could be asked, 'don't you make it not the presumption of atheism but the presumption of agnosticism?'— Antony Flew
Most recently, the terms apathetic and pragmatic agnosticism have been coined with regard to the view that there is no proof of either the existence or non-existence of any deity, but since any deity that may exist appears unconcerned for the universe or the welfare of its inhabitants, the question is largely academic and that their existence therefore has little to no impact on personal human affairs and should be of little theological interest.
Agnostic (from Ancient Greek ἀ- (a-), meaning "without", and γνῶσις (gnōsis), meaning "knowledge") was used by Thomas Henry Huxley in a speech at a meeting of the Metaphysical Society in 1869 to describe his philosophy, which rejects all claims of spiritual or mystical knowledge.
Early Christian church leaders used the Greek word gnosis (knowledge) to describe "spiritual knowledge". Agnosticism is not to be confused with religious views opposing the ancient religious movement of Gnosticism in particular; Huxley used the term in a broader, more abstract sense. Huxley identified agnosticism not as a creed but rather as a method of skeptical, evidence-based inquiry.
In recent years, scientific literature dealing with neuroscience and psychology has used the word to mean "not knowable". In technical and marketing literature, "agnostic" can also mean independence from some parameters—for example, "platform agnostic" or "hardware agnostic".
Scottish Enlightenment philosopher David Hume contended that meaningful statements about the universe are always qualified by some degree of doubt. He asserted that the fallibility of human beings means that they cannot obtain absolute certainty except in trivial cases where a statement is true by definition (e.g. tautologies such as "all bachelors are unmarried" or "all triangles have three corners").
Agnosticism has sometimes been divided into two categories in academic and philosophical treatment:
- Strong agnosticism (also called "hard", "closed", "strict", or "permanent agnosticism")
- The view that the question of the existence or nonexistence of a deity or deities, and the nature of ultimate reality is unknowable by reason of our natural inability to verify any experience with anything but another subjective experience. A strong agnostic would say, "I cannot know whether a deity exists or not, and neither can you."
- Weak agnosticism (also called "soft", "open", "empirical", or "temporal agnosticism")
- The view that the existence or nonexistence of any deities is currently unknown but is not necessarily unknowable; therefore, one will withhold judgment until evidence, if any, becomes available. A weak agnostic would say, "I don't know whether any deities exist or not, but maybe one day, if there is evidence, we can find something out."
Agnosticism is sometimes used colloquially to refer to plurality of beliefs. An agnostic in this case might claim, "The concepts of a universe with or without a God represent intellectual tools that aid our exploration of reality; neither of these ideas are inherently wrong and both bear a useful conceptual utility."
Agnostic thought, in the form of skepticism, emerged as a formal philosophical position in ancient Greece. Its proponents included Protagoras, Pyrrho, Carneades, Sextus Empiricus and, to some degree, Socrates, who was a strong advocate for a skeptical approach to epistemology.
Pyrrho said that we should refrain from making judgment as we can never know the true reality. According to Pyrrho, having opinion was possible, but certainty and knowledge are impossible. Carneades was also a skeptic in relation to all knowledge claims. He proposed a probability theory, however. According to him, certainty could never be attained. Protagoras rejected the conventional accounts of the gods. He said:
Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be. Many things prevent knowledge including the obscurity of the subject and the brevity of human life.
Who really knows?
Who will here proclaim it?
Whence was it produced? Whence is this creation?
The gods came afterwards, with the creation of this universe.
Who then knows whence it has arisen?
Hume, Kant, and Kierkegaard
Aristotle, Anselm, Aquinas, and Descartes presented arguments attempting to rationally prove the existence of God. The skeptical empiricism of David Hume, the antinomies of Immanuel Kant, and the existential philosophy of Søren Kierkegaard convinced many later philosophers to abandon these attempts, regarding it impossible to construct any unassailable proof for the existence or non-existence of God.
Let us call this unknown something: God. It is nothing more than a name we assign to it. The idea of demonstrating that this unknown something (God) exists, could scarcely suggest itself to Reason. For if God does not exist it would of course be impossible to prove it; and if he does exist it would be folly to attempt it. For at the very outset, in beginning my proof, I would have presupposed it, not as doubtful but as certain (a presupposition is never doubtful, for the very reason that it is a presupposition), since otherwise I would not begin, readily understanding that the whole would be impossible if he did not exist. But if when I speak of proving God's existence I mean that I propose to prove that the Unknown, which exists, is God, then I express myself unfortunately. For in that case I do not prove anything, least of all an existence, but merely develop the content of a conception.
Hume was Huxley's favourite philosopher, calling him "the Prince of Agnostics". Diderot wrote to his mistress, telling of a visit by Hume to the Baron D'Holbach, and describing how a word for the position that Huxley would later describe as agnosticism didn't seem to exist, or at least wasn't common knowledge, at the time.
The first time that M. Hume found himself at the table of the Baron, he was seated beside him. I don't know for what purpose the English philosopher took it into his head to remark to the Baron that he did not believe in atheists, that he had never seen any. The Baron said to him: "Count how many we are here." We are eighteen. The Baron added: "It isn't too bad a showing to be able to point out to you fifteen at once: the three others haven't made up their minds."— Denis Diderot
Thomas Henry Huxley
Agnostic views are as old as philosophical skepticism, but the terms agnostic and agnosticism were created by Huxley to sum up his thoughts on contemporary developments of metaphysics about the "unconditioned" (William Hamilton) and the "unknowable" (Herbert Spencer). Though Huxley began to use the term "agnostic" in 1869, his opinions had taken shape some time before that date. In a letter of September 23, 1860, to Charles Kingsley, Huxley discussed his views extensively:
I neither affirm nor deny the immortality of man. I see no reason for believing it, but, on the other hand, I have no means of disproving it. I have no a priori objections to the doctrine. No man who has to deal daily and hourly with nature can trouble himself about a priori difficulties. Give me such evidence as would justify me in believing in anything else, and I will believe that. Why should I not? It is not half so wonderful as the conservation of force or the indestructibility of matter ...
It is no use to talk to me of analogies and probabilities. I know what I mean when I say I believe in the law of the inverse squares, and I will not rest my life and my hopes upon weaker convictions ...
That my personality is the surest thing I know may be true. But the attempt to conceive what it is leads me into mere verbal subtleties. I have champed up all that chaff about the ego and the non-ego, noumena and phenomena, and all the rest of it, too often not to know that in attempting even to think of these questions, the human intellect flounders at once out of its depth.
And again, to the same correspondent, May 6, 1863:
I have never had the least sympathy with the a priori reasons against orthodoxy, and I have by nature and disposition the greatest possible antipathy to all the atheistic and infidel school. Nevertheless I know that I am, in spite of myself, exactly what the Christian would call, and, so far as I can see, is justified in calling, atheist and infidel. I cannot see one shadow or tittle of evidence that the great unknown underlying the phenomenon of the universe stands to us in the relation of a Father [who] loves us and cares for us as Christianity asserts. So with regard to the other great Christian dogmas, immortality of soul and future state of rewards and punishments, what possible objection can I—who am compelled perforce to believe in the immortality of what we call Matter and Force, and in a very unmistakable present state of rewards and punishments for our deeds—have to these doctrines? Give me a scintilla of evidence, and I am ready to jump at them.
Of the origin of the name agnostic to describe this attitude, Huxley gave the following account:
When I reached intellectual maturity and began to ask myself whether I was an atheist, a theist, or a pantheist; a materialist or an idealist; Christian or a freethinker; I found that the more I learned and reflected, the less ready was the answer; until, at last, I came to the conclusion that I had neither art nor part with any of these denominations, except the last. The one thing in which most of these good people were agreed was the one thing in which I differed from them. They were quite sure they had attained a certain "gnosis"–had, more or less successfully, solved the problem of existence; while I was quite sure I had not, and had a pretty strong conviction that the problem was insoluble. And, with Hume and Kant on my side, I could not think myself presumptuous in holding fast by that opinion ...
So I took thought, and invented what I conceived to be the appropriate title of "agnostic". It came into my head as suggestively antithetic to the "gnostic" of Church history, who professed to know so much about the very things of which I was ignorant. ... To my great satisfaction the term took.
In 1889, Huxley wrote:
Therefore, although it be, as I believe, demonstrable that we have no real knowledge of the authorship, or of the date of composition of the Gospels, as they have come down to us, and that nothing better than more or less probable guesses can be arrived at on that subject.
William Stewart Ross
William Stewart Ross wrote under the name of Saladin. He championed agnosticism in opposition to the atheism of Charles Bradlaugh as an open-ended spiritual exploration. In Why I am an Agnostic (c. 1889) he claims that agnosticism is "the very reverse of atheism".
Robert G. Ingersoll
In an 1896 lecture titled Why I Am An Agnostic, Ingersoll related why he was an agnostic:
Is there a supernatural power—an arbitrary mind—an enthroned God—a supreme will that sways the tides and currents of the world—to which all causes bow? I do not deny. I do not know—but I do not believe. I believe that the natural is supreme—that from the infinite chain no link can be lost or broken—that there is no supernatural power that can answer prayer—no power that worship can persuade or change—no power that cares for man.
I believe that with infinite arms Nature embraces the all—that there is no interference—no chance—that behind every event are the necessary and countless causes, and that beyond every event will be and must be the necessary and countless effects.
Is there a God? I do not know. Is man immortal? I do not know. One thing I do know, and that is, that neither hope, nor fear, belief, nor denial, can change the fact. It is as it is, and it will be as it must be.
In the conclusion of the speech he simply sums up the agnostic position as:
We can be as honest as we are ignorant. If we are, when asked what is beyond the horizon of the known, we must say that we do not know.
Bertrand Russell's pamphlet, Why I Am Not a Christian, based on a speech delivered in 1927 and later included in a book of the same title, is considered a classic statement of agnosticism. He calls upon his readers to "stand on their own two feet and look fair and square at the world with a fearless attitude and a free intelligence".
In 1939, Russell gave a lecture on The existence and nature of God, in which he characterized himself as an atheist. He said:
The existence and nature of God is a subject of which I can discuss only half. If one arrives at a negative conclusion concerning the first part of the question, the second part of the question does not arise; and my position, as you may have gathered, is a negative one on this matter.
However, later in the same lecture, discussing modern non-anthropomorphic concepts of God, Russell states:
That sort of God is, I think, not one that can actually be disproved, as I think the omnipotent and benevolent creator can.
As a philosopher, if I were speaking to a purely philosophic audience I should say that I ought to describe myself as an Agnostic, because I do not think that there is a conclusive argument by which one can prove that there is not a God. On the other hand, if I am to convey the right impression to the ordinary man in the street I think I ought to say that I am an Atheist, because when I say that I cannot prove that there is not a God, I ought to add equally that I cannot prove that there are not the Homeric gods.
An agnostic thinks it impossible to know the truth in matters such as God and the future life with which Christianity and other religions are concerned. Or, if not impossible, at least impossible at the present time.
Are Agnostics Atheists?
No. An atheist, like a Christian, holds that we can know whether or not there is a God. The Christian holds that we can know there is a God; the atheist, that we can know there is not. The Agnostic suspends judgment, saying that there are not sufficient grounds either for affirmation or for denial.
Later in the essay, Russell adds:
I think that if I heard a voice from the sky predicting all that was going to happen to me during the next twenty-four hours, including events that would have seemed highly improbable, and if all these events then produced to happen, I might perhaps be convinced at least of the existence of some superhuman intelligence.
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... many professing agnostics are nearer belief in the true God than are many conventional church-goers who believe in a body that does not exist whom they miscall God.
Of course, the human soul will always have the power to reject God, for choice is essential to its nature, but I cannot believe that anyone will finally do this.
Raised in a religious environment, Charles Darwin studied to be an Anglican clergyman. While eventually doubting parts of his faith, Darwin continued to help in church affairs, even while avoiding church attendance. Darwin stated that it would be "absurd to doubt that a man might be an ardent theist and an evolutionist". Although reticent about his religious views, in 1879 he wrote that "I have never been an atheist in the sense of denying the existence of a God. – I think that generally ... an agnostic would be the most correct description of my state of mind."
Demographic research services normally do not differentiate between various types of non-religious respondents, so agnostics are often classified in the same category as atheists or other non-religious people.
A 2010 survey published in Encyclopædia Britannica found that the non-religious people or the agnostics made up about 9.6% of the world's population. A November–December 2006 poll published in the Financial Times gives rates for the United States and five European countries. The rates of agnosticism in the United States were at 14%, while the rates of agnosticism in the European countries surveyed were considerably higher: Italy (20%), Spain (30%), Great Britain (35%), Germany (25%), and France (32%).
A study conducted by the Pew Research Center found that about 16% of the world's people, the third largest group after Christianity and Islam, have no religious affiliation. According to a 2012 report by the Pew Research Center, agnostics made up 3.3% of the US adult population. In the U.S. Religious Landscape Survey, conducted by the Pew Research Center, 55% of agnostic respondents expressed "a belief in God or a universal spirit", whereas 41% stated that they thought that they felt a tension "being non-religious in a society where most people are religious".
According to the 2011 Australian Bureau of Statistics, 22% of Australians have "no religion", a category that includes agnostics. Between 64% and 65% of Japanese and up to 81% of Vietnamese are atheists, agnostics, or do not believe in a god. An official European Union survey reported that 3% of the EU population is unsure about their belief in a god or spirit.
Agnosticism is criticized from a variety of standpoints. Some religious thinkers see agnosticism as limiting the mind's capacity to know reality to materialism. Some atheists criticize the use of the term agnosticism as functionally indistinguishable from atheism; this results in frequent criticisms of those who adopt the term as avoiding the atheist label. Some thinkers and philosophers deny the validity of agnosticism, seeing it as a limitation of humankind's capacity to know the reality, by asserting that human intelligence has a non-material, spiritual element. They affirm that "not being able to see or hold some specific thing does not necessarily negate its existence," using gravity, entropy, reason and thought as examples.
Theistic critics claim that agnosticism is impossible in practice, since a person can live only either as if God did not exist (etsi deus non-daretur), or as if God did exist (etsi deus daretur).
Religious scholars such as Laurence B. Brown criticize the misuse of the word agnosticism, claiming that it has become one of the most misapplied terms in metaphysics. Brown raises the question, "You claim that nothing can be known with certainty ... how, then, can you be so sure?"
According to Pope Benedict XVI, strong agnosticism in particular contradicts itself in affirming the power of reason to know scientific truth. He blames the exclusion of reasoning from religion and ethics for dangerous pathologies such as crimes against humanity and ecological disasters. "Agnosticism", said Ratzinger, "is always the fruit of a refusal of that knowledge which is in fact offered to man ... The knowledge of God has always existed". He asserted that agnosticism is a choice of comfort, pride, dominion, and utility over truth, and is opposed by the following attitudes: the keenest self-criticism, humble listening to the whole of existence, the persistent patience and self-correction of the scientific method, a readiness to be purified by the truth.
The Catholic Church sees merit in examining what it calls "partial agnosticism", specifically those systems that "do not aim at constructing a complete philosophy of the unknowable, but at excluding special kinds of truth, notably religious, from the domain of knowledge". However, the Church is historically opposed to a full denial of the capacity of human reason to know God. The Council of the Vatican declares, "God, the beginning and end of all, can, by the natural light of human reason, be known with certainty from the works of creation".
Blaise Pascal argued that even if there were truly no evidence for God, agnostics should consider what is now known as Pascal's Wager: the infinite expected value of acknowledging God is always greater than the finite expected value of not acknowledging his existence, and thus it is a safer "bet" to choose God.
Peter Kreeft and Ronald Tacelli cited 20 arguments for God's existence, asserting that any demand for evidence testable in a laboratory is in effect asking God, the supreme being, to become man's servant.
According to Richard Dawkins, a distinction between agnosticism and atheism is unwieldy and depends on how close to zero a person is willing to rate the probability of existence for any given god-like entity. About himself, Dawkins continues, "I am agnostic only to the extent that I am agnostic about fairies at the bottom of the garden." Dawkins also identifies two categories of agnostics; "Temporary Agnostics in Practice" (TAPs), and "Permanent Agnostics in Principle" (PAPs). Dawkins considers temporary agnosticism an entirely reasonable position, but views permanent agnosticism as "fence-sitting, intellectual cowardice".[not in citation given]
Ignosticism is the view that a coherent definition of a deity must be put forward before the question of the existence of a deity can be meaningfully discussed. If the chosen definition is not coherent, the ignostic holds the noncognitivist view that the existence of a deity is meaningless or empirically untestable.
A.J. Ayer, Theodore Drange, and other philosophers see both atheism and agnosticism as incompatible with ignosticism on the grounds that atheism and agnosticism accept "a deity exists" as a meaningful proposition that can be argued for or against.
- Apophatic theology
- Asimov's Guide to the Bible
- Avidyā (Buddhism)
- Ignoramus et ignorabimus
- List of agnostics
- Objectivism (Ayn Rand)
- Religious skepticism
- Russell's teapot
- Unknown God
- Hepburn, Ronald W. (2005) . "Agnosticism". In Donald M. Borchert. The Encyclopedia of Philosophy. 1 (2nd ed.). MacMillan Reference USA (Gale). p. 92. ISBN 0-02-865780-2.
In the most general use of the term, agnosticism is the view that we do not know whether there is a God or not.(page 56 in 1967 edition)
- Rowe, William L. (1998). "Agnosticism". In Edward Craig. Routledge Encyclopedia of Philosophy. Taylor & Francis. ISBN 978-0-415-07310-3.
In the popular sense, an agnostic is someone who neither believes nor disbelieves in God, whereas an atheist disbelieves in God. In the strict sense, however, agnosticism is the view that human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does not exist. In so far as one holds that our beliefs are rational only if they are sufficiently supported by human reason, the person who accepts the philosophical position of agnosticism will hold that neither the belief that God exists nor the belief that God does not exist is rational.
- "agnostic, agnosticism". OED Online, 3rd ed. Oxford University Press. September 2012.
A person who believes that nothing is known or can be known of immaterial things, especially of the existence or nature of God.
In extended use: a person who is not persuaded by or committed to a particular point of view; a sceptic. Also: person of indeterminate ideology or conviction; an equivocator.
Of or relating to the belief that the existence of anything beyond and behind material phenomena is unknown and (as far as can be judged) unknowable. Also: holding this belief.
a. In extended use: not committed to or persuaded by a particular point of view; sceptical. Also: politically or ideologically unaligned; non-partisan, equivocal.
agnosticism n. The doctrine or tenets of agnostics with regard to the existence of anything beyond and behind material phenomena or to knowledge of a First Cause or God.line feed character in
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If you ask me if there exists another world (after death), ... I don't think so. I don't think in that way. I don't think otherwise. I don't think not. I don't think not not.
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While the pious might wish to look to the gods to provide absolute moral guidance in the relativistic universe of the Sophistic Enlightenment, that certainty also was cast into doubt by philosophic and sophistic thinkers, who pointed out the absurdity and immorality of the conventional epic accounts of the gods. Protagoras' prose treatise about the gods began "Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be. Many things prevent knowledge including the obscurity of the subject and the brevity of human life."
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Properly considered, agnosticism is not a third alternative to theism and atheism because it is concerned with a different aspect of religious belief. Theism and atheism refer to the presence or absence of belief in a god; agnosticism refers to the impossibility of knowledge with regard to a god or supernatural being. The term agnostic does not, in itself, indicate whether or not one believes in a god. Agnosticism can be either theistic or atheistic.
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Let Agnostic Theism stand for that kind of Agnosticism which admits a Divine existence; Agnostic Atheism for that kind of Agnosticism which thinks it does not.
- Barker, Dan (2008). Godless: How an Evangelical Preacher Became One of America's Leading Atheists. New York: Ulysses Press. p. 96. ISBN 978-1-56975-677-5. OL 24313839M.
People are invariably surprised to hear me say I am both an atheist and an agnostic, as if this somehow weakens my certainty. I usually reply with a question like, "Well, are you a Republican or an American?" The two words serve different concepts and are not mutually exclusive. Agnosticism addresses knowledge; atheism addresses belief. The agnostic says, "I don't have a knowledge that God exists." The atheist says, "I don't have a belief that God exists." You can say both things at the same time. Some agnostics are atheistic and some are theistic.
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- Graham Oppy (September 4, 2006). Arguing about Gods. Cambridge University Press. pp. 15–. ISBN 978-1-139-45889-4.
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- [[Stanford Encyclopedia of Philosophy]]. URL–wikilink conflict (help)
- Agnosticism at PhilPapers
- Agnosticism at the Indiana Philosophy Ontology Project
- Albert Einstein on Religion Shapell Manuscript Foundation
- Why I Am An Agnostic by Robert G. Ingersoll, .
- Dictionary of the History of Ideas: Agnosticism
- Agnosticism from INTERS – Interdisciplinary Encyclopedia of Religion and Science
- Agnosticism – from ReligiousTolerance.org
- What do Agnostics Believe? – A Jewish perspective
- Fides et Ratio – the relationship between faith and reason Karol Wojtyla 
- For a utilitarian analysis of religion, see The (F)Utility of Religion: Who Needs God(s)?–A Prospective Bible for Non-Believers at http://bradmusil.kramernet.org
- The Natural Religion by Dr Brendan Connolly, 2008
- Nielsen, Kai (1973) . "Agnosticism". Dictionary of the History of Ideas. University of Virginia Library.