John Adams said:

The government of the United States is not, in any sense, founded on the Christian religion.

Thomas Paine said:

The study of theology, as it stands in Christian churches, is the study of nothing; it is founded on nothing; it rests on nothing; it proceeds by no authorities; it has no data; it can demonstrate nothing and admits of no conclusion.

The Bible: a history of wickedness that has served to corrupt and brutalise mankind.

The Christian system of religion is an outrage on common sense.

The Church was resolved to have a New Testament, and out of the loads of rubbish that were presented it voted four to be Gospels, and others to be Epistles, as we now find them arranged.

This is the rubbish called Revealed Religion!

Thomas Jefferson said:

I do not find in orthodox Christianity one redeeming feature.

Religions are all alike – founded upon fables and mythologies.

History, I believe, furnishes no example of a priest-ridden people maintaining a free civil government. This marks the lowest grade of ignorance of which their civil as well as religious leaders will always avail themselves for their own purposes.

In every country and in every age, the priest has been hostile to liberty. He is always in alliance with the despot, abetting his abuses in return for protection to his own.

Christianity is the most perverted system that ever shone on man.

George Washington said:

Religious controversies are always productive of more acrimony and irreconcilable hatreds than those which spring from any other cause. I had hoped that liberal and enlightened thought would have reconciled the Christians so that their religious fights would not endanger the peace of Society.

James Madison said:

During almost fifteen centuries has the legal establishment of Christianity been on trial. What has been its fruits? More or less, in all places, pride and indolence in the clergy; ignorance and servility in the laity; in both, superstition, bigotry, and persecution.

In no instance have the churches been guardians of the liberties of the people.

Religious bondage shackles and debilitates the mind and unfits it for every noble enterprise.

Benjamin Franklin said:

I have found Christian dogma unintelligible. Early in life, I absented myself from Christian assemblies.

Theodore Roosevelt said:

To discriminate against a thoroughly upright citizen because he belongs to some particular church, or because, like Abraham Lincoln, he has not avowed his allegiance to any church, is an outrage against that liberty of conscience which is one of the foundations of American life.