Based on the Bible you claim to follow, you are a ravening wolf seeking whom to devour (1 Peter 5:8) Nationalism has zero to do with anything Jesus taught.

The definition of nationalism: "identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations."

This definition does not truly describe what it originally meant. It was originally about race. Take care nation in that definition and use the word race and you get the idea. This is why Fascists and the like are drawn to nationalism.

There are no Christian nations and attempting to make a nation a Christian nation is also being a false prophet. Biblically, false prophets come in the form of a sheep that follows Jesus, but their fruit is the fruit of organized Christianity the last 1,500 years. Slavery, war, abuse, Capitalistic law of the jungle, and wealth building.

If you believe the Bible as you claim, the way of Jesus is not built by turning nations Christian, but by serving your fellow humans with long suffering. Christian Nationalism is just another form of Fascism.