Islam accepts all other religions, and sees, for example, the Bible, the Torah, and the Koran as all being part of one huge book.
Reza Aslan: Islam sees itself very much as part of the long Judeo-Christian, biblical, prophetic tradition with which most Americans are familiar. Muslims accept the Torah and the Hebrew bible in its entirety, as well as the gospels and the rest of the New Testament, as part of the self-revelation of God that comes from Adam, the first man, and according to Islam, the first prophet to Muhammad, the seal of the prophets. They see this as one, long narrative – a master narrative – in which the revelation of God, the self-communication of God, is passed down through the prophetic consciousness of one prophet after another, after another, after another. And in fact, Islam takes this one step further and talks the concept called the Umm al-Kitab, the mother of books. This notion that exists in the Koran that all revealed scriptures – whether they be the Hebrew bible, or the New Testament, or whether they be the Bagadavita, or the Upanishads or the ___________ – all revealed scriptures are essentially derived from a singled source in heaven called the mother of books. And that God’s self-communication has been passed down to humanity not in its entirety, but in pieces. And as the Koran says “deliberately so” for God could have as the Koran says “created one nation, one book and one prophet”; but He chose instead to create many nations, and many books, and many laws, and many prophets, “so that,” the Koran says, “the nations may know one another.” So there is this concept within Islam that all religions are inextricably linked to each other through this passing on of a prophetic consciousness. I think, to me, that’s a really beautiful way of thinking about religion. Now of course Muslims believe that comes to an end at the prophet Muhammad, but I think an argument could be made that the revelation of God did not stop with the prophets’ last breath. That God is ever-present and eternal, and that the human societies, the human nations that He made are in a constant state of evolution. They did not come to a stop 14 centuries ago.