Concept

Agnosticism

Intro

"I don't know whether God exists. Maybe nobody can know."

Agnosticism is the position that the question of God's existence cannot be settled, either at all or by the person speaking. It is not the same as atheism. Atheism says no God exists. Agnosticism says we cannot know whether one does. It is a claim about knowledge, not about belief.

The word was coined in 1869 by the biologist Thomas Henry Huxley, a friend and defender of Charles Darwin. Huxley wanted a label for his own position that was neither theist nor atheist. The word combines the Greek a, meaning "without," with gnostos, meaning "known." Together they mean "without knowledge." Huxley intended it as a methodological commitment, not a creed: follow the evidence, refuse to commit when the evidence is insufficient.

The position comes in several flavors.

Weak or open agnosticism says, "I don't know right now, but maybe enough evidence could settle it." This is the form most ordinary people mean when they call themselves agnostic.

Strong or closed agnosticism says, "No one can ever know. The question is unanswerable in principle." This is a much bigger claim and is harder to defend, because the speaker has to know something about the nature of all possible evidence in order to rule it out in advance.

Apatheistic agnosticism says, "I don't care. It doesn't matter to my life." This is less a philosophical position than a temperamental one.

Agnostic theism holds belief in God while admitting that "knowledge" in the strict philosophical sense is too strong a word for what the believer has. Many thoughtful Christians fit here. Trust is not the same as certainty.

Agnostic atheism lacks belief in God without claiming proof that no God exists. This is the position Richard Dawkins and most New Atheist writers actually hold when pressed, even though they are often louder than that suggests.

The Christian response is to take the open version seriously and to push back on the closed version. Open agnosticism is the right starting point for honest investigation. Closed agnosticism makes a sweeping claim about the limits of all possible knowledge that the speaker cannot back up. And apathetic agnosticism is not really an answer at all. If God might exist and might have made you and might be calling you, indifference is not a serious response.

The conversation move is to offer evidence. The honest agnostic who says, "convince me," is a better conversation partner than the entrenched atheist. The page lays out the history, varieties, ancient antecedents (Protagoras, the Buddha's silence on metaphysics), and the modern lineage through Hume, Kant, Huxley, Russell, and others.

In full

Agnosticism is the epistemological position that the existence or non-existence of God (or other ultimate supernatural reality) cannot be known, either in principle (strong agnosticism) or by the individual given current evidence (weak agnosticism). The term was coined by biologist Thomas Henry Huxley in 1869 to describe his own stance, distinct from theism, deism, atheism, idealism, and materialism alike. Agnosticism makes a claim about knowledge, not about belief: the agnostic suspends judgment on whether sufficient grounds for certainty exist, while leaving the underlying belief question open or unanswered. As a worldview category it spans a wide range of attitudes, from the earnest seeker who expects evidence to eventually settle the question, to the committed suspender who holds the question permanently unanswerable.

History and etymology

The word is formed from the Greek a- ("without") + gnostos ("known, knowable"), yielding "without knowledge" or "unknowable." Huxley reportedly coined it at a meeting of the Metaphysical Society in 1869, intending to contrast his position with the "gnostics" of various stripes who claimed confident knowledge of ultimate things. His intent was methodological: agnosticism was not a creed but a commitment to follow evidence wherever it leads and to refuse assent where evidence falls short. He opposed it equally to dogmatic theism and to dogmatic atheism.

Ancient antecedents exist without the label. Protagoras of Abdera (c. 485-415 BC) wrote, "Concerning the gods, I cannot know whether they exist or not, nor what form they might take; for there are many obstacles to such knowledge, the obscurity of the subject and the shortness of human life." This is the earliest extant statement of the agnostic posture in the Western tradition. The Buddha's canonical silence on metaphysical questions (avyākata, the "undetermined" or "unanswered" questions) addresses whether the world is eternal, whether the self persists after death, and similar matters, not precisely the God-question as Western philosophy frames it, but reflects a cognate methodological restraint: the questions do not conduce to liberation and are set aside. Medieval theological apophaticism (Pseudo-Dionysius, Maimonides) is worth distinguishing: it denies that positive predications of God are adequate to the divine nature, not that God's existence is unknowable; it is theistic-apophatic, not agnostic. The difference matters: the apophatic theologian affirms God exists and then denies that human language reaches him; the agnostic suspends even the existence-claim.

The modern lineage runs through David Hume's Dialogues Concerning Natural Religion (posthumous, 1779), which established the template for skeptical engagement with natural-theology arguments without settling the underlying question; through Immanuel Kant's critique of speculative metaphysics in the Critique of Pure Reason (1781), which argued that the cosmological and ontological arguments overreach the bounds of possible experience; and into the 19th and 20th centuries via Huxley himself, Robert Ingersoll ("the great agnostic," 1833-1899), Bertrand Russell (Why I Am Not a Christian, 1927), and more recently Anthony Kenny (The God of the Philosophers, 1979).

Varieties

Agnosticism is not a single position but a family of stances, divided by scope (in-principle vs. in-practice) and by attitude (passive vs. active vs. indifferent):

Weak (open) agnosticism, "I do not currently know whether God exists, but the question is in principle answerable and I could be persuaded either way given sufficient evidence." The most common self-reported form.
Strong (closed) agnosticism, "It is impossible in principle for anyone to know whether God exists." The knowledge-claim itself is ruled out, not merely absent. Sometimes called absolute agnosticism.
Apathetic agnosticism (apatheism), the question of God's existence is regarded as practically irrelevant or uninteresting. Functionally the individual lives as if the question had no bearing on life.
Agnostic theism, "I believe God exists but I do not claim to have knowledge of this in the strict philosophical sense." Common among religious believers with epistemically modest self-descriptions.
Agnostic atheism, "I lack belief in God but I do not claim to know with certainty that no God exists." The dominant self-description among contemporary New Atheist writers (Dawkins, Hitchens, Harris in certain framings). See Atheism is a Belief.
Pragmatic agnosticism, the question may in principle be answerable but pursuing it yields no practical benefit; the individual suspends the inquiry rather than the verdict.
Spiritual agnosticism, open to transcendence, meaning, or the sacred without committing to any specific theological framework; common in "spiritual but not religious" demographics.

The knowledge-belief distinction

Much confusion about agnosticism traces to conflating two distinct questions:

What do you believe? (the doxastic question), answered by theism, atheism, or suspension of belief.
What do you claim to know? (the epistemic question), answered by gnosticism (confident knowledge) or agnosticism (acknowledged ignorance or uncertainty).

The two axes are orthogonal. They generate four coherent positions:

	Gnostic (claims to know)	Agnostic (claims no knowledge)
Theist (believes God exists)	Gnostic theist, "I know God exists"	Agnostic theist, "I believe but don't claim to know"
Atheist (lacks belief in God)	Gnostic atheist, "I know no God exists"	Agnostic atheist, "I lack belief but don't claim to know"

Agnosticism properly understood occupies the right column of this table regardless of row. This distinction matters apologetically: a self-described agnostic who says "I just don't know" may be saying something about knowledge, not about belief, and those require different responses. See also Can You Be an Agnostic Atheist or Theist.

Key thinkers

Thomas Henry Huxley (1825-1895), biologist, "Darwin's bulldog," coiner of the term. His debate with Bishop Samuel Wilberforce (1860 Oxford) became a landmark in science-religion public discourse. Collected Essays, vol. 5 (1894) contains his extended discussion of agnosticism as a method, not a creed.
Robert Ingersoll (1833-1899), American freethinker and orator; widely called "the great agnostic." His popular lectures reached large audiences skeptical of orthodox Christianity.
Bertrand Russell (1872-1970), philosopher and logician; identified as agnostic philosophically (he could not disprove God) but as atheist in practical terms (no positive evidence warranted belief). See Bertrand Russell for his specific arguments.
Anthony Kenny (1931-2022), Catholic-trained Oxford philosopher who left the priesthood; explicitly agnostic in The God of the Philosophers (1979). Argued that neither classical theism's God nor simple theism's God can be shown to exist by the arguments offered.
Carl Sagan (1934-1996), astronomer and science communicator; The Demon-Haunted World (1995) articulates a skeptical empiricist stance; described himself as agnostic.
Thomas Nagel (b. 1937), philosopher; Mind and Cosmos (2012) argues against neo-Darwinian materialism and expresses sympathy for teleological explanations, while remaining personally agnostic about theism. One of the most philosophically serious sympathetic-but-uncommitted thinkers of recent decades.

Christian apologetic engagement

Points of contact

Intellectual humility about ultimate questions is genuinely virtuous and not a Christian concession but a Christian conviction. Scripture itself marks the limits of human knowledge before God (1 Corinthians 13:12; Job 38-41; Ecclesiastes 3:11). The agnostic's admission that the question is difficult is more honest than confident dismissal.
The "we don't have all the answers" stance reflects a shared recognition that ultimate metaphysical questions resist easy resolution. Mature Christian epistemology (Plantinga, Wolterstorff) affirms fallibilism and epistemic humility while maintaining that warranted belief is possible.
Conversion from agnosticism or atheism to Christianity is historically frequent and includes intellectually rigorous cases: C. S. Lewis, Alister McGrath, Francis Collins, Lee Strobel, Antony Flew (to deism), Holly Ordway, Sarah Irving-Stonebraker, Mortimer Adler. See the section below on notable conversions.

Points of divergence

The unliveable-agnosticism critique, pure suspension of judgment is psychologically and practically unstable. Every person acts as if some answer is effectively true: one either prays or does not, treats moral claims as grounded in something beyond social convention or does not, lives as if death is the end or does not. Functional behavior implies a working assumption. The demand for perfect suspension before acting is not how rational agents navigate any other existential question.
The evidence-asymmetry critique, agnostics rarely apply radical epistemic suspension to historical, scientific, or philosophical questions that are equally underdetermined by direct observation. The cumulative case for theism, cosmological, teleological, moral, and historical-evidential arguments, provides grounds for weighing the question (cross-reference Cumulative Case for Christian Theism). Refusing to weigh that evidence on principled agnostic grounds while treating other kinds of evidence normally is not consistent epistemic policy; it is special pleading.
The divine-hiddenness challenge, J. L. Schellenberg's Divine Hiddenness argument is the strongest agnostic-leaning philosophical objection: if a perfectly loving God exists, no person capable of a relationship with God would remain nonresistantly without belief; yet many do; therefore, probably no such God exists. Orthodox-Christian responses include the epistemic-distance defense (Hick, Murray), the soul-making theodicy (Hick, Stump), the Pauline diagnosis of suppression (Romans 1:18-21), and the Christological-mode-of-revelation reply (Moser, Stump): God's self-disclosure in Christ is personally demanding, not merely informational, and may by design not be available to detached observers.
The practical-decidability response, Pascal's Wager addresses the agnostic specifically: even if epistemic suspension is warranted, the asymmetry of outcomes under uncertainty gives rational grounds for practical commitment on the theist hypothesis rather than indifference. See Pascals Wager.
The Reformed-epistemology response, Alvin Plantinga's framework argues that belief in God can be properly basic, arising through the sensus divinitatis without inference from evidence. The agnostic's demand for prior evidential warrant presupposes classical evidentialism, which itself faces objections: virtually no foundational belief (other minds, the past, the external world) meets its own standard. See Reformed Epistemology.

The agnostic-atheism contemporary shift

Most self-identified atheists in the contemporary West are technically agnostic atheists: they claim no certain knowledge that no God exists but lack belief in God. This rhetorical shift, accelerated by the New Atheist movement of the 2000s (Dawkins, The God Delusion, 2006), relocates the burden of proof entirely onto the theist. The Christian apologetic response has two prongs: (a) accepting that the theist does bear some burden and can discharge it via cumulative-case arguments; (b) contesting whether the "mere absence of belief" framing accurately represents the positive claims most atheists actually make in practice. See Atheism is a Belief for the extended treatment.

Notable conversions from agnosticism

C. S. Lewis, moved from atheism through agnosticism to theism (1929) then to Christianity (1931); see Surprised by Joy (1955). See C S Lewis.
Alister McGrath, Marxist atheist-agnostic at Oxford; converted to Christianity in the early 1970s; now one of the leading defenders of Christian intellectual credibility.
Francis Collins, geneticist and former NIH director; raised secular agnostic; became a Christian in his late 20s; The Language of God (2006) recounts the journey.
Lee Strobel, legal journalist and self-described atheist-agnostic; converted in 1981 after investigating the evidence for the resurrection; The Case for Christ (1998).
Antony Flew (1923-2010), philosopher and prominent atheist for five decades; announced in 2004 that he had become a deist on the basis of the fine-tuning argument; did not embrace Christianity but the shift was philosophically consequential. See Antony Flew.
Holly Ordway, literary scholar and agnostic; converted to Christianity circa 2006; Not God's Type: An Atheist Academic Lays Down Her Arms (2010).
Sarah Irving-Stonebraker, Australian historian; atheist; converted to Christianity around 2014; Priests of History: Stewarding the Past in an Age of Unbelief (2024).
Mortimer Adler (1902-2001), philosopher and editor of Great Books of the Western World; self-described agnostic for most of his career; baptized Catholic in 1984.

Demographics

The category is hard to isolate in survey data. Self-identified "agnostics" consistently appear as a small fraction (1-5%) of Western populations, with much larger "unaffiliated," "nothing in particular," or "spiritual but not religious" categories that may encompass functionally agnostic positions without the label. Pew Research data from 2020-2023 shows the religiously unaffiliated ("nones") growing in the United States to roughly 28-30% of adults, while strict self-identified agnostics remain a subset. The practical significance for apologetics is that a large portion of the mission field operates with implicit agnostic assumptions even without using the term: the person who says "I don't know what to believe" or "I think there might be something out there" is often functionally agnostic rather than atheist, and the apologetic approach appropriate to that person differs from the approach appropriate to the committed atheist.