Per Scripture Jesus is our “only Sovereign.” The New Testament refers to followers of Christ by a variety of names. It NEVER refers to them/us as ‘kings.’ Never.
If you’re still referring to Cruz as a king in the tradition of Saul, David, and Solomon, that’s stupid. The US doesn’t have kings. We are a Republic.
Who said ‘render unto caesar’ ?
YOU were the one who was alleging cruz was a king.