Men never do evil so completely and cheerfully as when they do it from religious conviction.
The true meaning of religion is thus, not simply morality, but morality touched by emotion.
I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
Religion is the belief in an ever-living God, that is, in a Divine Mind and Will ruling the Universe and holding moral relations with mankind.
Religion is the masterpiece of the art of animal training, for it trains people as to how they shall think.
Religion is like a pair of shoes... Find one that fits for you, but don't make me wear your shoes.
I would rather live my life as if there is a God and die to find out there isn't, than live as if there isn't and to die to find out that there is.
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.
Religion is regarded by the common people as true, by the wise as false, and by rulers as useful.
The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.
The more I study religions the more I am convinced that man never worshipped anything but himself.
The world holds two classes of men: intelligent men without religion, and religious men without intelligence.