Of course it is about morality, as presented according to our Faith in God and what that teaches us. Civil law must be decided by all people, or at least the majority. That is what a democracy is supposed to provide for. When any Church determines civil law we no longer have a democracy.
As Jesus advised: “Render unto Ceasar what is Ceasar’s and to God what is God’s.”
We have freedom of religion in this country, which means that the state can’t make laws concerning our faith (and does all the time). It also means that the Church should not be making laws in the name of the state as far as I am concerned. The Church has her laws that the faithful are called to live by and that is where it needs to stay.
That decided withing the context of secular life will never be perfectly Christian. Perfectly Christian societies will happen not through law, but through faith.