I went on a bit of a rant in a Facebook post. Thought I'd share part of it here too.

People always make the claim that America was founded in Christianity. If we look at the 10 Commandments, ‘Thou shalt have no other gods before me’ ‘Thou shalt not take the name of the Lord thy God in vain’ is in direct violation of the first amendment that protects freedom of religion and freedom of speech. United States of America was not founded on the Bible. It was founded on the declaration of Independence and the Constitution. In these documents a god or deity was only mentioned in this part
“ When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.”
The Founding Fathers were not Christian, they had beliefs that closely represent a type of Deism. Deism is a belief in a supreme being that created everything but does not intervene in the universe. They give the concepts of luck, laws of physics, why things exist, just about everything people didn’t understand at the time the title of God. That is why they used the language of ‘Nature’s God’ and ‘Creator’. Here are some of the things the founding fathers have said;

Benjamin Franklin, “I have found Christian dogma unintelligible. Early in life, I absenteed myself from Christian assemblies.”

Thomas Jefferson, “Christianity neither is, nor ever was a part of the common law.”

George Washington's Letter to Edward Newenham, founders.archives.gov. June 22, 1792, “Religious controversies are always productive of more acrimony and irreconcilable hatreds than those which spring from any other cause: And I was not without hopes that the enlightened and liberal policy of ⟨the present⟩ age would have put an effectual stop to contentions of this Kind.”

John Adams, “This would be the best of all possible worlds, if there were no religion in it.”