(like me, they have every right to say what they think.)
Well, that's not true Schmoe, unless you don't mind being offensive. Living and believing in a free society does
not mean one can say whatever they want. And even if it's not illegal or potentially hazardous, it can still be offensive.
I agree that it would be interesting to see which principles they are referring to. My understanding is that most of the ideas in the constitution came from ancient Greece, long before the christian era.
As the first settlers (Mayflower era) were Christian (Protestant), so were most that arrived here from Europe after them. So it is natural, that by extension, these beliefs were formative in their thought processes, including the construction of the Constitution, don't you think?