They aren't wrong. A predictible realization of christian nationalism is a throwback to a pre-christian pharacitical theacracy. This is what Christ called the synogogue of Satan. This is how most churches are organized, with anti-christian authoritarianiam. The new testament epistles demonstrate this eventual departure from the gospel. Christ came to free us from the law, not redeem us unto sonship by forcing us to follow any of God's two commandments.
There is only one true christan nation, one lead by Christ himself when he returns. Any govenance short of that will be a satanic beast built on bondage, theft, lies and murder. One can only improve our condition when this is taken to heart.