Not one of us is without sin. That being said, those who believe in a theocracy should consider what that really means. Islamic states are theocracies.
The ideal “Christian” state (short of Jesus’ personal return) would in fact not code Christianity into its laws, but rather the most generous allowance for its practice that is possible. Because it’s going to have unbelievers, and it wants to act seemly even towards the unbelievers.
I chuckle a bit about that, though. We are utter sin basket cases, as far as the pure view of the Lord is concerned. We sometimes tend to think a bunch of mortal compromises is a real good Christian life. It might be as close to perfect as we can get before going through those pearly gates, but it still is pretty ghastly.