The other day I picked up Pope John Paul II's brief comments on Islam from Crossing the Threshold of Hope, p. 92-93. I thought their succinctness and clarity worth recording. Pope John Paul II writes: (italics in the original)
"As a result of their monotheism, believers in Allah are particularly close to us. . . .
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.
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.
Nevertheless, the religiosity of Muslims deserves respect. It is impossible not to admire, for example, their fidelity to prayer. The image of believers in Allah who, without caring about time or place, fall to their knees and immerse themselves in prayer remains a model for all those who invoke the true God, in particular for those Christians who, having deserted their magnificent cathedrals, pray only a little or not at all."