Medieval scholars framed Islam as a mixture of truth and error needing assessment

Evidence

IT was not possible simply to dismiss Islam as a concoction of errors; it was that, but truth which could not be ignored was mixed with the error. The difficulty was to assess the value of truths in such a context. It was from the discussion of this problem that the final assessment of the significance of Islam, and of its place in the history of the world, derived. There seemed always to be duality in Islam, of truth and untruth. The Qur’an witnessed, as we have seen, to the truth of Scripture and to the existence of one God, as well as to certain other matters.! Falsely it asserted the prophethood of Muhammad, and so unintentionally revealed its own falsity; falsely also, it asserted the prophethood of Jesus, but in doing so asserted many truths. It was not wrong to call Christ a prophet; the error was to deny His divinity. — Norman Daniel, Islam and the West, 897