Lastly and once again, I ask you or anyone else to identify the principles upon which this nation was founded and that are also uniquely Christian. One thing is certain, the idea that all religions are equal, which is essentially the principle underpinning the First Amendment's allowing freedom of religious expression, is not a Christian principle. Indeed, it's not a principle promulgated by any religion.
We are endowed by our Creator with inalienable rights. What religion(s), besides Christianity, espoused those beliefs at that time? The First Amendment only prohibited the establishment of a national religion, such as the Church of England (headed by King George III).