The church is the way, the outpost of the kingdom of God, where we are in a training pattern toward eternity with one another. That has implications for the way that we act in the outside world, because we’re having our consciences shaped to know how to use power responsibly. When John the Baptist is talking to the tax collectors and to the soldiers in Luke 3, they’re asking, “What do we now do?” And he’s giving to them directives as to how they are to act personally in terms of conscience. What he’s not giving is a blueprint for the Roman military or for the Roman tax collection system. 

Russell Moore discusses Christian nationalism on the PloughCast.