Medieval Christian polemicists treated Islamic predestination as a theological error inviting rebuttal.

Evidence

When the Islamic concept of the predestination of ordinary events was known, it was seen in purely theological terms as concerned with the mysteries of election. In this belief, said Lull, God was made the author of men’s sins; the Judgement on the Last Day became false, and man was relieved of moral responsibility. A short Creed of unusual perspicacity gave as the second item of the belief of Islam, ‘they believe all evil things, as well as good things, to be from God, the fault and the will’. The reprobatio quoted Bukhari. — Norman Daniel, Islam and the West, 873