As the link below points out, Christian Nationalism isn't Christian. It's a political ideology that is divisive and, therefore, anti-Christian. Anyone advocating "Christian Nationalism" is simply a racist fuckwit wearing Christianity as a mask to hide their evilness.
Only racists believe human beings are divided into races. Factual, sane and educated people know the "race" is a social construct and not genetic.
https://www.christianitytoday.com/ct/2021/february-web-only/what-is-christian-nationalism.html
American Christians in the past were exemplary in helping establish the American experiment, and many American Christians worked to end slavery and segregation and other evils. They did so because they believed Christianity required them to work for justice. But they worked to advance Christian principles, not Christian power or Christian culture, which is the key distinction between normal Christian political engagement and Christian nationalism. Normal Christian political engagement is humble, loving, and sacrificial; it rejects the idea that Christians are entitled to primacy of place in the public square or that Christians have a presumptive right to continue their historical predominance in American culture. Today, Christians should seek to love their neighbors by pursuing justice in the public square, including by working against abortion, promoting religious liberty, fostering racial justice, protecting the rule of law, and honoring constitutional processes. That agenda is different from promoting Christian culture, Western heritage, or Anglo-Protestant values.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8604262/
The completion of the Human Genome Project in 2003 confirmed humans are 99.9% identical at the DNA level and there is no genetic basis for race.