Criticism of Muhammad

The first to criticize the Islamic prophet Muhammad were his non-Muslim Arab contemporaries, who decried him for preaching monotheism, and the Jewish tribes of Arabia, for what they claimed were unwarranted appropriation of Biblical narratives and figures and vituperation of the Jewish faith. For these reasons, medieval Jewish writers commonly referred to him by the derogatory nickname ha-Meshuggah (Hebrew: מְשֻׁגָּע‬, "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 handling of doctrinal matters and his promises of carnal pleasure in the afterlife.

Modern criticism has concerned Muhammad's sincerity as a prophet, his morality, his marriages, his sex life, his ownership of slaves and his psychological condition. Muhammad has also been accused of sadism and cruelty in the treatment of his enemies, including in the invasion of the Banu Qurayza tribe in Medina.