Two things:
1. little of your post would have made sense in 1947, and I think you know what I’m driving at.
2. The “Americaninzation” of Christianity frustrates me as well. It is not about Americans. It is about Christians. And, not to sound too nutty, I don’t think American flags belong in churches. They are not secular organizations. I’m seeing little in the NT about patriotism. The bible is about two things, the second of which is a subset of the first: Man’s relationship with his Creator and man’s relationship with his fellow man.
I am curious do you see anything in the NT about the kingdom? I hope you don’t believe that the kingdom, which the parable of the tares says has children of the wicked on in it, is only spiritual, or only future. That is hermenuetical suicide.