Christianity is such a silly religion.

Nothing proves the man-made character of religion as obviously as the sick mind that designed hell.

Christianity is the most ridiculous, the most absurd, and bloody religion that has ever infected the world.

[In a letter to Frederick the Great]

Of all the systems of religion that ever were invented, there is no more derogatory to the Almighty, more unedifying to man, more repugnant to reason, and more contradictory to itself than this thing called Christianity. Too absurd for belief, too impossible to convince, and too inconsistent for practice, it renders the heart torpid or produces only atheists or fanatics. As an engine of power, it serves the purpose of despotism, and as a means of wealth, the avarice of priests, but so far as respects the good of man in general it leads to nothing here or hereafter.

Of all the systems of religion that ever were invented, there is none more derogatory to the Almighty, more unedifying to man, more repugnant to reason, and more contradictory in itself than this thing called Christianity. Too absurd for belief, too impossible to convince, and too inconsistent for practice, it renders the heart torpid, or produces only atheists and fanatics. As an engine of power it serves the purpose of despotism; and as a means of wealth, the avarice of priests; but so far as respects the good of man in general, it leads to nothing here or hereafter.

What was ridiculous about Christianity, from the perspective of a cultivated pagan, was not only its language—the crude style of the Gospels’ Greek resting on the barbarous otherness of Hebrew and Aramaic—but also its exaltation of divine humiliation and pain conjoined with an arrogant triumphalism.

But the belief of a God is so weakened by being mixed with the strange fable of the Christian creed, and with the wild adventures related in the Bible, and of the obscurity and obscene nonsense of the Testament, that the mind of man is bewildered as in a fog.

Christianity is a death cult gone horribly wrong.

By what route do otherwise sane men come to believe such palpable nonsense? How is it possible for a human brain to be divided into two insulated halves, one functioning normally, naturally and even brilliantly, and the other capable only of such ghastly balderdash which issues from the minds of Baptist evangelists? Such balderdash takes various forms, but it is at its worst when it is religious. Why should this be so? What is there in religion that completely flabbergasts the wits of those who believe in it? I see no logical necessity for that flabbergasting. Religion, after all, is nothing but an hypothesis framed to account for what is evidentially unaccounted for. In other fields such hypotheses are common, and yet they do no apparent damage to those who incline to them. But in the religious field they quickly rush the believer to the intellectual Bad Lands. He not only becomes anaesthetic to objective fact; he becomes a violent enemy of objective fact. It annoys and irritates him. He sweeps it away as something somehow evil. . .

The Christian imagination bas produced nothing but an insipid legend.

Mormonism, it seems to me, is—objectively—just a little more idiotic than Christianity is. It has to be: because it is Christianity plus some very stupid ideas.

People who believed in Him were deluded. The believers in God might be intelligent, but they were mentally benighted. The gears in that part of the brain which dealt with religion had been put into neutral, and they were spinning. Or the circuit of religion had been disconnected from the main circuit of the intellect.
That was a bad analogy. People use their intellect to justify the nonintellective, emotionally based phenomenon called religion. Often brilliantly. But, as far as she was concerned, uselessly.

The weak spot of religion is its ridiculousness

The idea of God was invented in the small hours of history by a scam who had genius; it somehow reeks too much of humanity, that idea, to make its azure origin plausible...