Christian polemicists denied the God of the Qur’an any share in the true divine

Evidence

Nicetas seems to argue in one chapter that Muhammad’s ‘admission’ of some things out of Scripture implies acceptance of Scripture, and that since he also asserts different things of his own invention of the same God, he makes God either not to exist or to be changeable; the God he speaks of does not accept the Christian Law, and so cannot be the true God; it follows that the God of Muhammad is really a devil. — Norman Daniel, Islam and the West, 59

Categorization

• XREF: Directly instantiates the vault’s claim about how Islam is cast as the West’s constitutive outside: a rival God declared a devil rather than a different revelation of the same one.
• DEEPTHINKING: The tightness of this argumentative move — that internal coherence between Muhammad’s citations and inventions is used to banish his God from the divine — is a striking early charter for theological exclusion of the Other.