"...White evangelical nationalism has historically been intertwined with a sense of divine mission and 'manifest destiny.' "
You hit all the nails on the head. Still, people don't like to hear about dangerous threats to their personal peace and prosperity. The Bible has a lot to say about these things.
From my vantage point MAGA's w.e.n. cheering section is neither Christian nor American, but they are traitors to both, and to the w.e.n. adherents I would say, "But I have this against you: You have abandoned your first love. Therefore, keep in mind how far you have fallen. Repent and perform the deeds you did at first. But if you do not repent, I will come to you and remove your lampstand from its place...
...He who has an ear, let him hear..." - Revelations 2:4-5 & 7. -