The best description I have ever heard of Christian Nationalism is, draping the gospel in an American flag.

A gospel draped in an American Flag is a false gospel, and this is the sin of the evangelical church in the United States at this hour. Nowhere is patriotism for one’s earthly country taught in the New Testament. There is nothing wrong with being patriotic if it’s kept in check under the fruit of the Spirit of self control, but we must understand that as Christians, this world is not our home and our true citizenship is in Heaven.

We are first and foremost ambassadors for Christ, living as in a foreign land. We are the children of Abraham, and like fathers in the faith, we are strangers and pilgrims on the earth. ~ Hebrews 11:13

As sojourners we are to pass the time of our journey in this world in the fear of the Lord (1 Peter 1:17), and as strangers and pilgrims we are to abstain from fleshly lusts which war against our souls (1 Peter 2:11). We are to live honestly among the Gentiles (the world) so that they will glorify God in the day of their visitation (1 Peter 2:12). The manner of life we life before the world matters. And becoming a political, Christian Nationalist who demonizes everyone who is of the opposite political party while behaving with attitudes of malice and strife, is not of the Kingdom of God and Christ