Anyone who is familiar with their doctrine and with what the Messengers actually proclaimed will know, as a matter of certainty, that their assertions contradict the words of the Messengers rather than agree with them. One must therefore choose: either affirm the Messengers and declare these people false, or deny the Messengers and endorse them. In practice they believe in the Messengers in one respect and disbelieve in them in another: they do not say that the Messengers were liars or ignorant, yet they refuse to credit them with everything they reported.
It is self-evident that when someone conveys information that does not correspond to reality, he is either deliberately lying or mistaken. These thinkers themselves acknowledge that the Messengers are the most knowledgeable of all creation concerning ultimate realities, that they are endowed with sanctified faculties by which they perceive what others cannot, and that they are among the most righteous and truthful of mankind. Once they grant the Messengers this highest perfection in knowledge and veracity, what they claim about the prophetic reports becomes self-contradictory, for it inevitably entails labeling the Messengers either liars or ignorant.
Hence their position on prophethood is riddled with inconsistencies: they have neither rejected the Messengers with the outright denial shown by those who disbelieve in all prophethood, nor have they accepted them with the wholehearted assent shown by believers who affirm them unconditionally. They are instead like those who "believe in part and disbelieve in part," and such people are true disbelievers. They belong to the wavering hypocrites—neither aligned with these nor with those. Among them are some whose hypocrisy and heresy are extensive, and others whose hypocrisy is less than that of their fellows.
Furthermore, Allah the Exalted has said: “It is not granted to any human being that Allah should speak to him except by revelation, or from behind a veil…”