Claim: Turkish author and former cleric Turan Dursun's turn to atheism was influenced by the Iranian skeptic philosopher, Ibn al-Rawandi, who was born in Greater Khorasan around 827 CE.
Evidence: A former Muslim cleric and scholar of Shia Islam, he became an atheist during his study of the history of monotheistic religions. Influenced by the 9th-century Iranian skeptic philosopher Ibn al-Rawandi, Dursun wrote a number of books about religion which included interpretations of Islamic texts, heavily criticizing Islam and the founders of its major branches. Turan Dursun (1934 – 4 September 1990) was a Turkish author and atheist who was a critic of Islam. 827 CE
Greater Khorasan Great Abbasid Empire Turkish Former mufti, author