I don't think it daft. I think it is half the picture.

"I am the Lord your God. You shall have no other God beside me." Are about the greatest words in any language. It makes us invunerable to all kinds of silly or evil movements and trends.

The two sides of the coin are how you reconcile "Christ is king." With "Submit to those in authority over you." It is actually quite easy. Christ delegates authority to his church and we submit ourselves to it in turn.

The state, in turn, is valid if it submits itself to Christ and to his Church. All throughout the Old testament God promises the restoration of the Davidic Kingdom. At no point does He promise a return to the time of Judges.

The mistake that the Jews made was in thinking that it was going to just go back to the way it was. A human king and Kingdom. But God had other plans. He did give us a human king, but it was himself. But now if we have a king we need a Kingdom. He delegates his authority to his ministers.

Look at Matthew 16:19 "I will give you the keys of the kingdom.."

That is a king handing authority to his representative.

You can complain about his choice but you cannot deny that he did it. He gave Simon a new name just like he did for Abraham and Israel when he confirmed that they would be Fathers of his nation. He gave him his authority.

The part you miss about Catholics is that we don't remotely think of the Pope as a king. He is the successor of Peter, the chief Steward of the king. The other bishops are in a similar position. This is why the Orthodox still have some authority. But the rock is Peter and those bishops that remain with him have a unique position in the kingdom.

That is how God guaranteed that we would be able to find the appropriate authorities to submit to. You can claim to follow Christ alone, but to reject the Kingdom is to reject the King.