Properly read, the Bible is the most potent force for atheism ever conceived.

For out of fear and need each religion is born, creeping into existence on the byways of reason.

When I do good, I feel good. When I do bad, I feel bad. That's my religion.

In Christianity neither morality nor religion come into contact with reality at any point.

One would suppose that the battle for religious liberty was won in the United States two hundred years ago. However, in the time since, and right now, powerful voices are always raised in favor of bigotry and thought control.

If I was a religious person, I'd be Roman Catholic, because if there is a God he must be Italian.

It will not do to investigate the subject of religion too closely, as it is apt to lead to infidelity.

Moralities and religions are the principal means by which one can make whatever one wishes out of man, provided one possesses a superfluity of creative forces and can assert one's will over long periods of time — in the form of legislation, religions, and customs.

There is no belief, however foolish, that will not gather its faithful adherents who will defend it to the death.

Islam is the best religion, with the worst followers.

When it is a question of money, everybody is of the same religion. Letter to Mme. d'Épinal, Ferney (1760-12-26)

Truth, in the matters of religion, is simply the opinion that has survived.

I have never made but one prayer to God, a very short one: ‘O Lord, make my enemies ridiculous.’ And God granted it.

I adopted the theory of Reincarnation when I was twenty six. Religion offered nothing to the point. Even work could not give me complete satisfaction. Work is futile if we cannot utilise the experience we collect in one life in the next. When I discovered Reincarnation it was as if I had found a universal plan I realised that there was a chance to work out my ideas. Time was no longer limited. I was no longer a slave to the hands of the clock. Genius is experience. Some seem to think that it is a gift or talent, but it is the fruit of long experience in many lives. Some are older souls than others, and so they know more. The discovery of Reincarnation put my mind at ease. If you preserve a record of this conversation, write it so that it puts men’s minds at ease. I would like to communicate to others the calmness that the long view of life gives to us.

I prefer rationalism to atheism. The question of God and other objects-of-faith are outside reason and play no part in rationalism, thus you don't have to waste your time in either attacking or defending.