"The Mohammedan never becomes a Catholic"

"IT [Islam] still converts pagan savages wholesale. It even attracts from time to time some European eccentric, who joins its body. But the Mohammedan never becomes a Catholic. No fragment of Islam ever abandons its sacred book, its code of morals, its organized system of prayer, its simple doctrine. In view of this, anyone with a knowledge of history is bound to ask himself whether we shall not see in the future a revival of Mohammedan political power, and a renewal of the old pressure of Islam on Christendom."

~Hilaire Belloc: The Great Heresies.