Founding Fathers Religious Quotes by James Madison, Thomas Paine, Thomas Jefferson, John Adams, Unknown, Benjamin Rush and many others.

And I have no doubt that every new example will succeed, as every past one has done, in showing that religion and Government will both exist in greater purity, the less they are mixed together.
The study of theology, as it stands in the Christian churches, is the study of nothing.
Christianity neither is, nor ever was a part of the common law.
We Recognize No Sovereign but God, and no King but Jesus!
It can not be emphasized too strongly or too often that this great nation was founded, not by religionists, but by Christians, not on religions, but on the gospel of Jesus Christ!
I do not believe in the creed professed by the Jewish church, by the Roman church, by the Greek church, by the Turkish church, by the Protestant church, nor by any church that I know of. My own mind is my own church.
It is error alone which needs the support of government. Truth can stand by itself.
It is too late in the day for men of sincerity to pretend they believe in the Platonic mysticisms that three are one, and one is three; and yet that the one is not three, and the three are not one.
The God who gave us life, gave us liberty at the same time.
Persecution is not an original feature in any religion; but it is always the strongly marked feature of all religions established by law.
Because we hold it for ‘a fundamental and undeniable truth’, that religion or ‘the duty which we owe to our Creator’ and the manner of discharging it, can be directed only by reason and conviction, not by force or violence.
This would be the best of all possible worlds, if there were no religion in it.
Rulers who wished to subvert the public liberty, may have found an established Clergy convenient auxiliaries. A just Government instituted to secure & perpetuate it needs them not.
The only means of establishing and perpetuating our republican forms of government is the universal education of our youth in the principles of Christianity by means of the Bible.
[N]o religious Test shall ever be required as a Qualification to any Office or public Trust under the United States.
Of all the animosities which have existed among mankind, those which are caused by difference of sentiment in religion appear to be the most inveterate and distressing, and ought most to be deprecated.
Union of religious sentiments begets a surprising confidence, and ecclesiastical establishments tend to great ignorance and corruption; all of which facilitate the execution of mischievous projects.