The main problem with Christian nationalism is it uses fear to manipulate and control people. True Christianity brings joy, peace and love. Yeah, the world might be going to hell, but the Lord said fear not.
Gal 5:19 Now the works of the flesh are evident: sexual immorality, impurity, sensuality,
Gal 5:20 idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions,
Gal 5:21 envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God.
Gal 5:22 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness,
Gal 5:23 gentleness, self-control; against such things there is no law.
Gal 5:24 And those who belong to Christ Jesus have crucified the flesh with its passions and desires.
Gal 5:25 If we live by the Spirit, let us also keep in step with the Spirit.
Gal 5:26 Let us not become conceited, provoking one another, envying one another.
I wonder how many on this thread have crucified the flesh and belong to Christ Jesus. I don't see much fruit.