You claim to know the first amendment, but you have it wrong.
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;"
Congress will not establish a state church. They will not have a "Church of America" like the Church of England.
That's it. Nothing about not allowing public governments to express the religion of the people who make it up.
Oh, that's the other part Liberals keep chopping off:
"or prohibiting the free exercise thereof;"
As far as our founders not being Christians.
Here are some of the Signers of the Constitution who had pretty strong Christian convictions:
http://churchvstate.blogspot.com/2007/10/our-founders-were-they-christian.html
•Franklin, Benjamin - Considered much more a Deist than a Christian. He was nonetheless a follower of the Bible, and said: "I have lived, sir, a long time, and the longer I live, the more convincing proofs I see of this truth -- God Governs in the Affairs of Men, And if a Sparrow cannot fall to the ground without His notice, Is it possible that an empire can rise without His aid?...Except the Lord build the house, They labor in vain who build it." (Delegate to Constitutional Convention, Signer of Constitution)
•Hamilton, Alexander - Proposed formation of the Christian Constitutional Society to spread Christian government around the world. After the Constitutional Convention of 1787, he stated: "For my own part, I sincerely esteem it a system which without the finger of God, never could have been suggested and agreed upon by such a diversity of interests." - from Diffine, D.P., One Nation Under God - How Close a Separation? (Delegate to Constitutional Convention, Signer of Constitution)
•Madison, James - Member of the Episcopal Church. He said, "The belief in a God, all powerful, wise, and good, [is] essential to the moral order of the world, and to the happiness of man." (Signer of Declaration of Independence, Delegate to Constitutional Convention, Signer of Constitution)
•McHenry, James - President of the first Bible Society in Baltimore. In soliciting funds for distribution of Bibles, he wrote: "...Consider also, the rich do not possess aught more precious than their Bible, and that the poor cnnot be presented by the rich with anything of greater value." (Delegate to Constitutional Convention, Signer of Constitution)
•Washington, George - Member of the Episcopal Church. In his prayer at Valley Forge he said, "Almighty and eternal Lord God, the great Creator of heaven and earth, and the God and Father of our Lord Jesus Christ; look down from heaven in pity and compassion upon me Thy servant, who humbly prorate myself before Thee." (Delegate to Constitutional Convention, Signer of Constitution)