WSJ
The research of Muhammad Sven Kalisch, Muslim convert and Germany's first professor of Islamic theology, is causing outrage among Muslims. His theory: The Prophet Muhammad probably never existed.
Wikipedia
Criticism of Muhammad has existed since the 7th century, when Muhammad was decried by his non-Muslim Arab contemporaries for preaching monotheism, and by the Jewish tribes of Arabia for what they claimed were unwarranted appropriation of Biblical narratives and figures, vituperation of the Jewish faith, and proclaiming himself as "the last prophet" without performing any miracle or showing any personal requirement demanded in the Hebrew Bible to distinguish a true prophet chosen by the God of Israel from a false claimant. For these reasons, they gave him the derogatory nickname ha-Meshuggah (Hebrew: ΧΦ°Χ©Φ»ΧΧΦΈΦΌΧ’β¬β, "the Madman" or "the Possessed"). During the Middle Ages various Western and Byzantine Christian thinkers considered Muhammad to be a perverted, deplorable man, a false prophet, and even the Antichrist, as he was frequently seen in Christendom as a heretic or possessed by demons. Some of them, like Thomas Aquinas, criticized Muhammad's promises of carnal pleasure in the afterlife.Modern religious and secular criticism of Islam has concerned Muhammad's sincerity in claiming to be a prophet, his morality, his ownership of slaves, his treatment of enemies, his marriages, his treatment of doctrinal matters, and his alleged psychological condition. Muhammad has been accused of sadism and mercilessness--including the invasion of the Banu Qurayza tribe in Medina--sexual relationships with slaves, and his marriage to Aisha when she was six years old, which according to most estimates was consummated when she was nine.
