I seem to remember someone in the Bible saying something like, “render unto Caesar what is Caesar’s and what is God’s unto God.” Christ was not going to be drawn into the morass that was Roman law in the Holy Land. The Jews hated Romans taxes but Christ was perhaps saying we need to worry more about God.
you don’t seem to understand the history of the holy roman empire or the united states. you can’t compartmentalize religious life and secular life. it’s why things degrade and societies that start out based on God’s laws, collapse.
you also forget God instituted government to perform certain functions according to the law of God, Godly justice, Godly protection of the weak - not to be the force to oppose God’s laws.
and, per your example, tax policy isn’t the same kind of issue as a clear moral issue like abortion, or government actively persecuting christians for trying to live their faith in every aspect of their lives when the very Constitution says government cannot restrict a person’s freedom of religion, but they ignore it and do it anyway.