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.

Religion is all bunk.

I have now disposed of all my property to my family. There is one thing more I wish I could give them, and that is the Christian religion.

One of the things that is wrong with religion is that it teaches us to be satisfied with answers which are not really answers at all.

Persecution is not an original feature in any religion but it is always the strongly marked feature of all religions established by law.

Nothing defines humans better than their willingness to do irrational things in the pursuit of phenomenally unlikely payoffs. This is the principle behind lotteries, dating, and religion.