Yet when the manifest defects of Muhammad’s life and writings have been allowed for, there remains in Islam, this faith he imposed upon the Arabs, much power and inspiration. One is its uncompromising monotheism; its simple enthusiastic faith in the rule and fatherhood of God and its freedom from theological complications. Another is its complete detachment from the sacrificial priest and the temple. It is an entirely prophetic religion, proof against any possibility of relapse towards blood sacrifices. In the Koran the limited and ceremonial nature of the pilgrimage to Mecca is stated beyond the possibility of dispute, and every precaution was taken by Muhammad to prevent the deification of himself after his death. And a third element of strength lay in the insistence of Islam upon the perfect brotherhood and equality before God of all believers, whatever their colour, origin or status.
These are the things that made Islam a power in human affairs. It has been said that the true founder of the Empire of Islam was not so much Muhammad as his friend and helper, Abu Bekr. If Muhammad, with his shifty character, was the mind and imagination of primitive Islam, Abu Bekr was its conscience and its will. Whenever Muhammad wavered Abu Bekr sustained him. And when Muhammad died, Abu Bekr became Caliph (= successor), and with that faith that moves mountains, he set himself simply and sanely to organize the subjugation of the whole world to Allah—with little armies of 3,000 or 4,000 Arabs—according to those letters the prophet had written from Medina in 628 to all the monarchs of the world.