Churchill on Islam: the strongest retrograde force in the world

How dreadful are the curses which Mohammedanism lays on its votaries! Besides the fanatical  frenzy, which is as dangerous in a man as hydrophobia in a dog, there is this fearful fatalistic apathy. The effects are apparent in many countries. Improvident habits, slovenly systems of agriculture, sluggish methods of commerce, and insecurity of property exist wherever the followers of the Prophet rule or live. A degraded sensualism deprives this life of its grace and refinement; the next of its dignity and sanctity. The fact that in Mohammedan law every woman must belong to some man as his absolute property (either as a child, a wife, or a concubine) must delay the final extinction of slavery until the faith of Islam has ceased to be a great power among men. Individual Moslems may show splendid qualities. Thousands become the brave and loyal soldiers of the Queen; all know how to die; but the influence of the religion paralyses the social development of those who follow it. No stronger retrograde force exists in the world. Far from being moribund, Mohammedanism is a militant and proselytizing faith. It has already spread throughout Central Africa, raising fearless warriors at every step; and were it not that Christianity is sheltered in the strong arms of science (the science against which it had vainly struggled) the civilisation of modern Europe might fall, as fell the civilisation of ancient Rome. (The River War, 2 volume edition of 1899, Vol.2, p. 248-2499, here or here.)

Here [in Mein Kampf] was the new Koran of faith and war: turgid, verbose, shapeless, but pregnant with its message. (The gathering Storm 1948, electronic edition 2002 by RosettaBooks, p. 77, here or here.)