At the heart of Xian nationalism is a hopeless contradiction. This is what we saw yesterday. Guns, violence and force under the banner "Jesus Saves
So here is the contradiction- does Jesus save? Or are we saved by law? It is the same old problem that Paul dealt with in Galatians

How is the kingdom of God built and what is its nature?
Jesus said, "My kingdom is not of this world. If my kingdom were of this world, then would my servants fight."

Christian nationalism hopes to bring about the kingdom by guns and violence and ruthless politicians. The only way any earthly ruler can enforce laws is by force. Jesus knew that, and he set his kingdom diametrically opposed to every kingdom of the earth.

If it is an earthly kingdom, it is not the kingdom of Christ. Politics has its place, but salvation is not its place.

As Sen. Sasse said yesterday, the task of politicians is to enforce order so that people can live their lives in peace. This is a good and healthy goal and sometimes it needs to be enforced with strength.
But it isn't the kingdom of God, and it won't save us.