"Whoever knows the Old and New Testaments, and then reads the Koran, clearly sees the process by which it completely reduces Divine Revelation. It is impossible not to note the movement away from what God said about himself, first in the Old Testament through the Prophets, and then finally in the New Testament through His Son. In Islam, all the richness of God’s self-revelation, which constitutes the heritage of the Old and New Testaments, has definitely been set aside.- John Paul II, Pope of Rome, quoted in Christianity and Plurality: Classic and Contemporary Readings by Richard J. Plantinga
“Some of the most beautiful names in the human language are given to the God of the Koran, but He is ultimately a God outside of the world, a God who is only Majesty, never Emmanuel, God with us. Islam is not a religion of redemption. There is no room for the Cross and the Resurrection. Jesus is mentioned, but only as a prophet who prepares for the last prophet, Muhammad. There is also mention of Mary, His Virgin Mother, but the tragedy of redemption is completely absent. For this reason not only the theology but also the anthropology of Islam is very distant from Christianity."
Thanks to Father Symeon Elias for this quote.