So I do not like the phrase separation of church and state because it can mean many things. It can mean what Jesus was talking about when he said given a Caesar what a Caesar is and God what is God. All Christians that seems to me have to recognize that the church and state are separate institutions. I prefer to focus on the law in the American context, the establishment clause. Congress shall make no law respecting an establishment of religion and now by incorporation states can create a law establishing a religion either. I think that means what it says. We aren't going to have a state in a church, the church of Oregon, the church of Arkansas. We aren't going to have a national church. Otherwise there is a lot of freedom that states and localities and the national government has to do. To, for instance, fund religious schools to protect religious pacifists. They don't have to tear down 1925 era crosses on public land as the separationist groups desire us to do.