Well, there's a pretty convincing argument to be made that many of the institutional structures of the country were rooted in Christian (specifically Protestant) attitudes and behaviors; James Webb makes the argument a lot better than I can, but he's not the only one. Now, given that the civil and criminal law of the several states is rooted in English common law (except for Louisiana, of course, where it's the Code Napoleon) you can make the persuasive argument that if, say, Utah is predominantly Mormon with a large Catholic minority, then if there's a consensus between Mormons and Catholics on what behavior should be proscribed, then that's the way it ought to be, and if you have a problem with that then maybe you ought to consider moving to Colorado, Nevada, or some other presumably more liberal state.

That argument tends to give a lot of people hives, but it is one way of doing federalism, and was actually the way things were done for most of the country's history.