Christianity is most admirably adapted to the training of slaves, to the perpetuation of a slave society; in short, to the very conditions confronting us today.... The rulers of the earth have realized long ago what potent poison inheres in the Christian religion. That is the reason they foster it; that is why they leave nothing undone to instill it into the blood of the people. They know only too well that the subtleness of the Christian teachings is a more powerful protection against rebellion and discontent than the club or the gun.

The Failure of Christianity (1913)