Oh well, I guess it would be fair to mention Imam Muhammad Sven Kalisch who lost the chair for Islamic pedagogy at the University of Münster after doubting the historical existence of Muhammad (and also Jesus and Moses) in 2008. He later came to the conclusion that the prophet never existed and renounced Islam in 2010. Official Islamic groups in Germany have confirmed him as an apostate.
teachings of the Bible are so muddled and self-contradictory that it was possible for Christians to happily burn heretics alive for five long centuries. It was even possible for the most venerated patriarchs of the Church, like St. Augustine and St. Thomas Aquinas, to conclude that heretics should be tortured (Augustine) or killed outright (Aquinas). Martin Luther and John Calvin advocated the wholesale murder of heretics, apostates, Jews, and witches. - Sam Harris, "Letter To A Christian Nation"
