Separation of church and state. That's what will keep us from going so far in that direction. I don't think it will happen here either, but we DO need to be aware that theoretically it *can* happen anywhere when the circumstances align to make it possible, and make sure we don't allow those circumstances to be created.
No, I don't see that kind of holocaust happening here. But I do see little pieces of similarity between the US now and Germany then. Little pieces.