Yes, the Founders were Christian. Yes, there are great point and paths of advice in the Bible. Yes, guns can be a necessity in self-protection.
But, there are many honest, hard-working, and patriotic Jews, Muslims, Buddhists, Unitarians, and atheists. The God of the Christian Bible is the God of Abraham and thus Jews and Muslims. So much evil done by all His Children in His Name, He probably wants left out of politics.
As for the story. The Constitution was written by imperfect men trying to replace the Articles of Confederation, a system that did not work. Having states not be accountable to a superior authority vested with the consent of those states is a recipe for civil war. Going back to the period between the end of the Revolution and before the Constitution is a bad idea and a bad story.