Medieval Europeans could not distinguish the Qur’an from other Islamic books.

Evidence

The Muslim belief that the Qur’an was sent down was understood in a general way, though the details and the implications of the doctrine were not fully grasped; there was a marked failure to distinguish between the Qur’an and other Islamic books thought to be equally authoritative. — Norman Daniel, Islam and the West, 1513

Categorization

• XREF: connects to: Early European translations of Islamic texts ignored most major source works besides the Quran