Medieval Christian polemicists presumed Muslims must accept the Christian Bible

Evidence

Yet this conception had a wide influence. We have just seen how the principal Christian thinkers considered that Muslims were bound by the Qur’an to accept the Christian canon of Scripture. Where the idea was not asserted, it was implicitly assumed. The general impression may be seen in serious writers remote from personal contact with Islam. Alan of Lille took it for granted that Muslim doctrines were based on heretical interpretation of canonical Scripture, and formed his own polemic accordingly. — Norman Daniel, Islam and the West, 315

Categorization

• XREF: Connects to Aziz/Razack’s claim that ‘Islam’ is constructed against an invented ‘Christian/Western’ norm — here, an actual medieval case where polemic imposes a foreign canon as the standard Muslims ‘must’ accept.