"William Cantwell Smith observes that

until Karl Marx and the rise of communism, the Prophet organized and launched the only serious challenge to Western civilization that it has faced in the whole course of its history ... Islam is the only positive force that has won converts away from Christianity – by the tens of millions ...According to the Ayatollah Khomeini and other Islamists, one glaring example of an attempt by the West to weaken the Muslim world was the division of the Ottoman empire, the largest Muslim state and home of the Caliph, into 20 or so "artificially created separate nations," when that empire fell in 1918.