Medieval Muslims attacked Christian Trinity and Incarnation as blasphemous polytheism

Evidence

Yet Muslim authors did not limit themselves to apologetics; they also actively attacked what they considered the grossest errors of Christian theology. The Christian doctrines of the Trinity and Incarnation offended Muslims (and Jews); it was blasphemous to worship Jesus, a human being created by God, as if he were God. It was scandalous to introduce Trinitarian divisions into God’s indivisible unity. These two central doctrines are attacked in the Koran, and Muslim polemicists vigorously refuted them, paying less attention to more minor doctrinal differences with Christianity. The Christians were “associators”: instead of worshiping the One True God, they gave him a bevy of associates as minor deities: Jesus, the saints, the monks and priests. — John V. Tolan, Saracens, 262

Categorization

• XREF: Grounds the historical depth of Quranic anti-Trinitarian polemic already mapped in vault claims about Islam-West opposition — the ‘associators’ charge is the doctrinal seed of later anti-Christian tropes.