Criticism of the Quran is an interdisciplinary field of study concerning the factual accuracy of the claims and the moral tenability of the commands made in the Quran, the holy book of Islam. The Quran is viewed to be the scriptural foundation of Islam and is believed by Muslims to have been sent down by God (Allah) and revealed to Muhammad by the angel Jabreel (Gabriel). It has been subject to criticism both in the sense of being studied by secular, (mostly) Western scholars who set aside doctrines of its divinity, perfection, unchangeability, etc. accepted by Muslim Islamic scholars; but also in the sense of being found fault with by those — including Christian missionaries and other skeptics hoping to convert Muslims — who argue it is not divine, not perfect and/or not particularly mora