Nothing. First principles show the contrast.
Jesus said God's rule (“The Kingdom of God”) is the essential fact of all He's created, and the only kind of “government” that brings “righteousness and peace and joy” (Romans 14:17) on earth. The prayer Jesus taught us ascribes “...the Kingdom and the power and the glory” to God ALONE, and tells us to seek that HIS will “be done on earth, as it is in heaven.”
“Christian Nationalists” predicate their idea of a perfect 'kingdom” on American socio-political theory, claiming it can only be achieved by Christians “dominating” what they call the “Seven Mountains” of human society (government, education, family, business, etc.). “Dominionism” and the “Seven Mountain Mandate” effectualiy take God's rule on earth to themselves: and perpetuate satan's lie to Eve that man can make himself God's equal.
Significantly, the Bible's only reference to “seven mountains” is in Revelation 17, where “Babylon the Great,” the “Mother” of all the earth's “abominations” and murderer of Christians, is portrayed as seated on seven mountains.
A church I recently left (at their request) didn't teach any of that from the pulpit. But for two years the church has hosted a class from the "Patriot Academy" that teaches hardcore “Christian Nationalism.” Leadership responded to my protest by saying they had no problem with that teaching.
