Cultural engagement
It used to be simple.
Or at least it looks like that in hindsight. America was founded on, broadly speaking, Judeo-Christian lines. The framers of the Constitution may well not have all been ‘evangelicals’ but they were all influenced by the King James Bible, as well as by the thinking on ‘freedom’ that grew out of John Locke and other Enlightenment tolerance proponents that, while in some cases certainly radical (the French Revolution), were themselves also operating within or reacting to the same basic set of principles and assumptions.