That makes no sense. The reason gov't is involved is to impose obligations on spouses who can produce children so that the state doesn't end up being responsible.
Can't your church do that? The state need to be responible for children? Why not your church community? The state didn't produce children, God did, and the state produces an entire business of social welfare. The churches should have more say, the government less. Bottom line, government is way to intrusive in our lives, let the gays be registered and have a government wedding. God will sort out those who violate his teachings.