The overwhelming numbers, of the designers of the United States Constitution[U.S.C.] were Christian. They knew full well the difference between Christianity, and Religion. The U.S.C. and the written Word, is for freedom; not bondage. Immanuel exposed the Fake-leaders, and a Fake-system: just as the U.S.C. does today.
America was founded on Christian principle/precepts. They were to be a solid foundation to build upon. America has a purpose and a destiny. Matt.13 explains how the wicked system was planted in the parable of the Wheat and the Tares.
In this earth-age, there are Two kingdoms in play: they go backwards to the Tree of Life, and the Tree of Knowledge. These Trees, represent an Establishment - that can Not change. We are admonished to not listen to the words, or looks, but the "fruits" that are produced, to know if a Tree is good or evil.
The first of the first Amendments in the U.S.C. deals with Religion; as it should. Remember, the Document is based on freedom! Under dictators, and kings the rules are constantly changed to keep people in bondage: this was never the intent of our Lord. The line in the sand, people have a choice on Whom, or What they will serve.
"Congress shall make no law respecting an ESTABLISHMENT of religion, or prohibiting the free exercise thereof." This represents freedom to chose[Deut.30:19] that our Founders were very aware of. They lived under a state-religion, and shed blood to get away from it.