Thomas Jefferson:

"I have examined all the known superstitions of the word, and I do not find in our particular superstition of Christianity one redeeming feature. They are all alike founded on fables and mythology. Millions of innocent men, women and children, since the introduction of Christianity, have been burnt, tortured, fined and imprisoned. What has been the effect of this coercion? To make one half the world fools and the other half hypocrites; to support roguery and error all over the earth."

"Christianity (has become) the most perverted system that ever shone on man. Rogueries, absurdities and untruths were perpetrated upon the teachings of Jesus by a large band of dupes and importers led by Paul, the first great corrupter of the teaching of Jesus."

"The clergy converted the simple teachings of Jesus into an engine for enslaving mankind and adulterated by artificial constructions into a contrivance to filch wealth and power to themselves...these clergy, in fact, constitute the real Anti-Christ.

Here's Thomas Paine:

"Among the most detestable villains in history, you could not find one worse than Moses. Here is an order, attributed to 'God' to butcher the boys, to massacre the mothers and to debauch and rape the daughters. I would not dare so dishonor my Creator's name by (attaching) it to this filthy book (the Bible)."

"Accustom a people to believe that priests and clergy can forgive sins...and you will have sins in abundance."

"The Christian church has set up a religion of pomp and revenue in pretended imitation of a person (Jesus) who lived a life of poverty."

Finally let's hear from James Madison:

"What influence in fact have Christian ecclesiastical establishments had on civil society? In many instances they have been upholding the thrones of political tyranny. In no instance have they been seen as the guardians of the liberties of the people. Rulers who wished to subvert the public liberty have found in the clergy convenient auxiliaries. A just government, instituted to secure and perpetuate liberty, does not need the clergy."

"Religion and government will both exist in greater purity, the less they are mixed together."