We have enslaved the rest of the animal creation, and have treated our distant cousins in fur and feathers so badly that beyond doubt, if they were able to formulate a religion, they would depict the Devil in human form.

Religion is the frozen thought of man out of which they build temples.

Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.

If any of you should ask me for an epitome of the Christian religion, I should say that it is in one word - prayer. Live and die without prayer, and you will pray long enough when you get to hell.

Religion is an illusion and it derives its strength from the fact that it falls in with our instinctual desires.