Medieval Christians claimed the Qur’an was partly invented by forced Jewish and Christian helpers.

Evidence

Tripoli contrasted with the simple idea of the Muslims, that Muhammad’s revelations were put into a book after his death, the Catholic ‘truth’ - that fifteen years after his death his companions met to discuss the compilation of a book, which they committed to ‘Uthman. He proved unequal to it, and he was given the forced assistance of Christians and Jews, who found no material in the Prophet’s life and doctrine, and invented their own book. — Norman Daniel, Islam and the West, 211

Categorization

• XREF: Parallels the shahada/scriptural-invention polemics and the general medieval Christian claim that Islam plagiarized corrupted scripture.