It is impossible for me to conceive of a character more utterly detestable than that of the Hebrew god.

Progress is born of doubt and inquiry. The Church never doubts, never inquires. To doubt is heresy, to inquire is to admit that you do not know—the Church does neither.

No man of sense in the whole world believes in devils any more than he does in mermaids, vampires, gorgons, hydras, naiads, dryads, nymphs, fairies, the Fountain of Youth, [or] the Philosopher's Stone. . . .

The hope of science is the perfection of the human race. The hope of theology is the salvation of a few, and the damnation of almost everybody.

Religion supports nobody. It has to be supported. It produces no wheat, no corn; it ploughs no land; it fells no forests. It is a perpetual mendicant. It lives on the labors of others, and then has the arrogance to pretend that it supports the giver.

It seems to me impossible for a civilized man to love or worship, or respect the God of the Old Testament. A really civilized man, a really civilized woman, must hold such a God in abhorrence and contempt... In the New Testament, death is not the end, but the beginning of punishment that has no end. In the New Testament the malice of God is infinite and the hunger of his revenge eternal... This frightful dogma, this infinite lie, made me the implacable enemy of Christianity. The truth is that this belief in eternal pain has been the real persecutor.

If a man really believes that God once upheld slavery; that he commanded soldiers to kill women and babes; that he believed in polygamy; that he persecuted for opinion's sake; that he will punish forever, and that he hates an unbeliever, the effect in my judgment will be bad. It always has been bad. This belief built the dungeons of the Inquisition. This belief made the Puritan murder the Quaker.