Person

Antony Flew

British analytic philosopher (1923-2010); for fifty years one of the world's leading philosophical atheists; coiner of the influential "presumption of atheism" argument (1976) that shifted the burden of proof onto the theist; author of dozens of books and essays attacking theism on logical, scientific, and ethical grounds. In 2004, after a half-century career as a public atheist, Flew announced his belief in God, specifically, a deistic God whose existence is the best explanation of cosmic fine-tuning, the origin of life, and DNA-encoded biological information. His conversion (There Is a God, 2007) is among the most consequential late-20th-c. shifts in atheist intellectual history; it deprived atheism of one of its most distinguished philosophical defenders and supplied Christian apologetics with a powerful conversion-narrative anchor.

Flew is one of the central figures Christian apologists deploy to demonstrate that atheism is not the intellectual default for those who follow the arguments most carefully. For Christian engagement, Flew matters in two phases: his pre-2004 atheist phase (the arguments to engage) and his post-2004 deist phase (the conversion to understand).

Biographical sketch

Born February 11, 1923, London. Son of Methodist minister Robert Newton Flew (Cambridge NT scholar; influential figure in early ecumenical movement) and Winifred Garrard.
Atheist by age 15, abandoned his father's faith in adolescence; the conversion is described in his memoir.
St. John's College, Oxford (1947-49), postwar undergraduate after RAF service in WWII; Gilbert Ryle was a major influence; member of Oxford Socratic Club where C.S. Lewis chaired and where Flew delivered "Theology and Falsification" (1950).
Lecturer / Professor, Christ Church Oxford (1949-50), University of Aberdeen (1950-54), University of Keele (1954-71; Professor of Philosophy 1954), University of Calgary (1972-73), University of Reading (1973-83; Professor of Philosophy).
Retired 1983; continued public-philosophical writing into the 2000s.
The 2004 conversion announcement, May 2004, Hertfordshire University symposium with Gary Habermas; published statement of belief in God.
Died April 8, 2010, Reading, England, age 87.

Pre-2004 atheist career, major works and arguments

"Theology and Falsification" (1950, then 1971 expanded)

Flew's first major philosophical contribution; delivered at the Oxford Socratic Club. Adapts Karl Popper's falsifiability criterion: theological claims ("God loves us"), if interpreted seriously, must be falsifiable by some empirical state of affairs. If no state of affairs would count against "God loves us", if every apparent disconfirmation (suffering, injustice, prayer-failure) is reinterpreted as compatible, then the claim has been qualified to death and is no longer a substantive assertion. The "death by a thousand qualifications" was Flew's most-cited image.

Christian response: falsificationism is itself a contested epistemological criterion; many serious empirical claims (theoretical physics, historical claims, mathematical existence) are not directly falsifiable; the falsificationist demand on theology is selectively applied. Also: many theological claims are falsifiable in principle (the Resurrection would be falsified by the production of the body; the moral claims would be falsified by clear demonstration of moral inversion).

God and Philosophy (1966)

Flew's first book-length philosophical case against theism. Systematic engagement with the major theistic arguments (cosmological, ontological, design, moral, religious experience); concludes each fails. The most-cited 1960s-70s atheist philosophical text.

The Presumption of Atheism (1976)

Flew's most influential single contribution. Argues that atheism is the proper default position because the burden of proof falls on the one making the positive existence-claim. In the absence of positive evidence for God, the rational position is not-belief (atheism). The position has been deployed throughout subsequent atheist apologetics; the Atheism is a Belief argument is the Christian apologetic defeater of the framing.

Flew's distinction:

Positive atheism, "I believe no God exists" (a positive claim, requiring warrant)
Negative atheism, "I do not believe God exists" (no positive claim, no warrant required)

Flew defended the negative atheism position as the proper philosophical default. (This is the same move Dawkins later popularized in The God Delusion.)

Other major

A Rational Animal (1978)
The Logic of Mortality (1987)
Atheistic Humanism (1993)
How to Think Straight (1998)
Merely Mortal? Can You Survive Your Own Death? (2000)

The 2004 conversion

What happened

In May 2004, at a symposium at Hertfordshire University, Flew engaged in conversation with Christian philosopher Gary Habermas (the two had been friends and intellectual interlocutors since the 1980s). At the conclusion of the symposium, Flew announced he had come to believe in God. The announcement was confirmed in a December 2004 Philosophia Christi interview with Habermas and Roy Varghese.

What he came to believe, and what he didn't

Flew did not convert to Christianity. He converted to deism, belief in a God who is the explanation of the cosmos but who does not (necessarily) intervene in history, perform miracles, answer prayer, or institute religion. Flew described his position as that of Aristotle or Einstein, God as the rational ground of the universe but not the personal-relational God of Abrahamic monotheism.

Flew remained openly skeptical of Christianity's specific historical-revelatory claims through his death.

What persuaded him

Three lines of evidence, by Flew's own account (There Is a God, 2007):

Cosmic fine-tuning. The improbable calibration of the fundamental constants and initial conditions of the universe for the possibility of life. Flew cited the convergence of arguments by Martin Rees (Just Six Numbers, 1999) and others.
The origin of life. The Cairns-Smith / Shapiro / Kauffman literature on the origin-of-life problem convinced Flew that the spontaneous emergence of self-replicating systems was vastly more improbable than mid-20th-c. atheist popular literature had suggested. The information-content problem in DNA was, for Flew, the decisive specific issue (cf. Stephen Meyer, Signature in the Cell, 2009).
The lawfulness of nature. The fact that the universe is intelligible, that there are laws, that mathematics describes nature with uncanny precision (Wigner's "unreasonable effectiveness"), required, for Flew, a rational ground. He cited Einstein and Stephen Hawking on the unintelligibility-of-the-intelligibility on pure-naturalism.

Skeptical responses to the conversion

Some atheist commentators (Mark Oppenheimer, NYT Magazine, 2007; Richard Carrier) suggested Flew's late-life cognitive decline made him susceptible to evangelical-Christian manipulation by Roy Varghese (Flew's co-author of There Is a God). The accusation was that the book did not faithfully represent Flew's views.

Counter: Flew gave on-camera, on-record interviews after the book's publication (2007-09) directly confirming the conversion in his own words. Habermas, Flew's longtime philosophical friend, has consistently maintained the conversion was genuine and Flew-driven, not Varghese-manufactured. The skeptical accusation, while popular in atheist online circles, is not well-supported by the evidence.

There Is a God: How the World's Most Notorious Atheist Changed His Mind (2007)

Co-authored with Roy Varghese; foreword by Habermas; appendix engaging the historical Jesus-question by N.T. Wright. The book is Flew's autobiographical-philosophical account of the conversion:

Part I, his atheist career and arguments
Part II, the scientific evidence that changed his mind (fine-tuning, origin of life, lawfulness of nature)
Part III, engaging the question of revelation (Flew's still-skeptical openness)
Appendix A, Habermas / Varghese exchange
Appendix B, N.T. Wright on the historical Resurrection (the closest Flew gets to engaging the Christian case for revelation)

The book is one of the most-cited late-20th-c. atheist-to-theist conversion narratives.

Significance for Christian apologetics

Demonstrates that atheism is not the intellectual default. The most rigorous following-of-the-arguments led the leading philosophical-atheist of his generation away from atheism. This is exactly what Christian apologists predict; it falsifies the New-Atheism "atheism is what reason demands" framing.
Validates the fine-tuning / origin-of-life arguments. Flew did not convert on emotional / pastoral grounds; he converted on scientific-philosophical grounds. The arguments that moved him (Martin Rees, Stephen Meyer, the lawfulness-of-nature) are the same arguments contemporary Christian apologetics deploys.
Models intellectual honesty. Flew publicly reversed a 50-year career position when the evidence demanded it, at significant cost to his standing in the atheist community he had led. This is the intellectual virtue Christian apologetics asks of skeptics; Flew embodied it.
Anchors the conversion-narrative tradition. Flew belongs in the cluster of major intellectual conversions: C.S. Lewis, Alister McGrath, Lee Strobel (Conversion 1981), Holly Ordway, Jennifer Fulwiler, Edith Stein, Francis Collins, Sarah Irving-Stonebraker, Jordan Peterson (2024). The pattern shows the intellectual movement is not unidirectionally secular.

Christian engagement / debate history

Gary Habermas, longtime friend; their resurrection-debate exchange (Did the Resurrection Happen?, 2004 ed. David Baggett) was foundational; Habermas was the principal interlocutor for the 2004 conversion announcement
William Lane Craig, Flew vs Craig debate (Does God Exist?, Madison, Wisconsin, February 1998; later published), pre-conversion; widely judged Craig-win
Alvin Plantinga, sustained philosophical exchanges across the decades
Roy Varghese, co-author of There Is a God; foundational figure in the late-Flew period
N.T. Wright, wrote appendix on historical-Resurrection for There Is a God