This list of converts to nontheism includes individuals who formerly identified with a religious affiliation but have since then openly rejected their belief in a god (or gods) or professed to agnosticism. The list is organised by former religious affiliation.
British ethologist, evolutionary biologist and author; was brought up as an Anglican until ceasing to believe in a deity in his teens, concluding that the theory of evolution was a better explanation for life's complexity
Ordained as "Father Antony", but left the Catholic priesthood and abandoned theism; then wrote works like The Totalitarian Church of Rome and stated that "Atheism will in this century be the common attitude of civilized people"
Leader of the Yugoslav Partisans, Europe's most effective anti-Nazi resistance movement; a Yugoslav revolutionary and statesman, serving in various roles from 1945 until his death in 1980; formerly Roman Catholic;, later became an atheist
Kamal Haasan – despite being born into a Hindu Brahmin family, declared himself an atheist
Goparaju Ramachandra Rao – Indian activist for atheism; wrote in We Become Atheists, "I was conventionally orthodox and superstitious in the days of my boyhood. I believed in the claims of divine revelations by my parental aunt."
Sarmad Kashani – 17th-century mystical poet and sufi saint; arrived from Persia to India; beheaded for assumed heresy by the Mughal emperor Aurangzeb; renounced Judaism, briefly converting to Islam and then Hinduism; later denounced all religions and rejected belief in God
Reproductive biologist; has worked with science fiction writers; co-wrote books including Evolving the Alien; his grandfather was a rabbi; he attends synagogue for cultural reasons, but is an atheist
Sociologist descended from a long line of rabbis; had an interest in religion as a social phenomenon; wrote The Elementary Forms of the Religious Life; was an agnostic by adulthood; besides an interest, he saw some value in religion, but stated, "We must discover the rational substitutes for these religious notions that for a long time have served as the vehicle for the most essential moral ideas."
^Vladislav Zubok; Constantine Pleshakov. Inside the Kremlin's Cold War: From Stalin to Khrushchev. pp. 4. ISBN 0674455312. Zubok and Pleshakov further state, "Many would later note, however, that his works were influenced by a distinctly Biblical style" and "his atheism remained rooted in some vague idea of a God of nature."
^Richard West, Tito and the Rise and Fall of Yugoslavia, p.211, Carroll & Graff, 1996 ISBN 0-7867-0332-6
"In one of his talks with Church officials, Tito went so far as to speak of himself 'as a Croat and a Catholic', but this comment was cut out of the press reports on the orders of Kardelj."
^Nikolaos A. Stavrou (ed.), Mediterranean Security at the Crossroads: a Reader, p.193, Duke University Press, 1999 ISBN 0-8223-2459-8
^Vjekoslav Perica, Balkan Idols: Religion and Nationalism in Yugoslav States, p.103, Oxford University Press US, 2004 ISBN 0-19-517429-1
^Kumar, Pramod (1992). Towards Understanding Communalism. Chandigarh: Centre for Research in Rural and Industrial Development. p. 348. ISBN978-81-85835-17-4. OCLC27810012. VD Savarkar was publicly an atheist. Even when he was the Hindu Mahasabha leader he used to publicly announce and advertise lectures on atheism, on why god is not there and why all religions are false. That is why when defining Hindutva, he said, Hindutva is not defined by religion and tried to define it in a non-religious term: Punyabhoomi.
^John Carlin (August 5, 2005). "Zackie's story: The man who took on Mbeki – and won". The Independent. London. Retrieved August 27, 2007. A homosexual, an atheist, and a militant anti-apartheid campaigner whose political ideas were forged on an intense reading of Marx, Lenin, and Trotsky...
^Kranenberg, Annieke (August 11, 2007). "'Als dit niet werkt, beledig ik Wilders wel'" (in Dutch). De Volkskrant. Retrieved May 9, 2008. Quote: (Translation) "In interviews he calls himself an atheist, but until now 'I have been left alone by the beardmonkeys (referring to Muslim fundamentalists). Perhaps I have to make myself heard just a little bit better, I should be more explicit in my aversion to Islam and religion in general." (Dutch) "In interviews noemt hij zichzelf atheïst, maar tot nog toe 'ben ik ongemoeid gelaten door de baardapen. Misschien moet ik een hardere toon aanslaan en wat explicieter zijn in mijn afkeer van de islam en religies in het algemeen.'"
^Humanistische Omroep, Link to video interview with Hafid Bouazza Quote: (Translation) "Believers live behind a fence, and non-believers live in a pasture and they know there are believers out there behind the fence." "It [religion] is a matter of conditioning, of brainwashing." "I know that when I die, it's over with me." (Dutch) "Gelovigen leven achter een hek, en ongelovigen in een weiland, waarin ze weten dat er gelovigen zijn die achter hekken wonen." "Het [religie] is een kwestie van conditionering, van hersenspoeling" "Ik weet dat het moment dat ik ter aarde word besteld, dat het afgelopen is met mij."
^Verdonschot, Leon (May 8, 2008). ""Ik kan niet leven zonder roes." Interview met Hafid Baouzza, gepubliceerd in Dif nr.1" (in Dutch). Leonverdonschot.nl. Retrieved May 9, 2008.[dead link] Quote: (Translation) "Look, I'm an atheist. I believe God does not exist, I do not believe in an afterlife. How terrible it may be: Hitler isn't in hell getting pinched in his ass with a trident. I'm fine with the fact there are people who do believe that and get comfort from it, like my mother. I just hope the influence of religion on policy makers will diminish, because my freedom is precious to me." (Dutch) "Kijk, ik ben atheïst. Ik geloof niet dat God bestaat, ik geloof niet dat er een hiernamaals is. Hoe gruwelijk ook: Hitler wordt op dit moment niet in de hel met een drietand in zijn reet geprikt. Dat er mensen zijn dat dat wél geloven en daar troost uit putten, mensen als mijn moeder: prima. Als de invloed van religies op beleidsmakers maar steeds kleiner wordt, want mijn vrijheid is me dierbaar."
^Obama, Barack (October 16, 2006). "My Spiritual Journey". TIME. Retrieved September 26, 2008. My father was almost entirely absent from my childhood, having been divorced from my mother when I was 2 years old; in any event, although my father had been raised a Muslim, by the time he met my mother he was a confirmed atheist, thinking religion to be so much superstition.
^Kirkpatrick, David (2010). The Facebook Effect: The Inside Story of the Company That Is Connecting the World. New York City: Simon & Schuster. pp. 20–21. ISBN 978-1-4391-0211-4. Retrieved November 9, 2010.
^Alef, Daniel. Mark Zuckerberg: The Face Behind Facebook and Social Networking, Titans of Fortune Publishing (2010)
^Schram 1966, p. 20; Terrill 1980, p. 11; Pantsov & Levine 2012, pp. 14, 17.