Distinguish between the holy and the profane (common)
I don't think it's possible, not truly or at least not wholly.
I believe in separation of powers and a separation between church and state, but I guess only so far.
The church is the church and has a role in the life of men, and the law is law and government has a different sphere than the church and a different mandate, but even then it still has mandate given by God.
So while I don't believe we can or even should police the bedrooms of society, I also can't separate God Himself from government either since what I do must be in His will.
I personally think some denominations go too far into the mixing of church and state, or at least have the tendency to sound like they are, but I'd rather err on the side of caution (more God) these days than on the side of too little.
And I say these days because what has been proven to me by society, namely, these Marxist orgs and LGB people, that equality under the law isn't the goal. The goal is the remaking of society itself.