"The Christian European West barely escaped destruction at the hands of the Moslems. At one point they were stopped near Tours and at another point, later on in time, outside the gates of Vienna. The Church throughout northern Africa was practically destroyed by Moslem power, and at the present hour, the Moslems are beginning to rise again.
If Moslemism is a heresy, as Hiliaire Belloc believes it to be, it is the only heresy that has never declined. Others have had a moment of vigor, then gone into doctrinal decay at the death of the leader, and finally evaporated in a vague social movement. Moslemism, on the contrary, has only had its first phase. There was never a time in which it declined, either in numbers, or in the devotion of its followers.
The missionary effort of the Church toward this group has been at least on the surface, a failure, for the Moslems are so far almost unconvertible. The reason is that for a follower of Mohammed to become a Christian is much like a Christian becoming a Jew. The Moslems believe that they have the final and definitive revelation of God to the world and that Christ was only a prophet announcing Mohammed, the last of God's real prophets.
At the present time, the hatred of the Moslem countries against the West is becoming a hatred against Christianity itself. Although the statesmen have not yet taken it into account, there is still grave danger that the temporal power of Islam may return and, with it, the menace that it may shake off a West which has ceased to be Christian, and affirm itself as a great anti-Christian world power. Moslem writers say, "When the locust swarms darken countries, they bear on their wings these Arabic words: 'We are God's host, each of us has ninety-nine eggs, and if we had a hundred, we should lay waste the world, with all that is in it.'"
From "The World's First Love" Originally published in 1952, Ignatius Press, Pgs. 200-201