Within the annals of history, the church state does not have an enviable track record. The church is powerful and a church state is even more powerful. Seventeenth century England was cursed by the religious whims of whomever was in power at the time. The citizens were alternately forced to worship in the catholic way and then in the anglican way under pain of prison or even death. The european inquisitions were all powerful and atheists like us would have been summarily executed by the most painful means imaginable. State sponsored religion is alive and well in many places even today. Where it exists is almost always in a country that has a preponderance of uneducated people
If we allowed our U.S. fundamentalists to gain exclusive power in government, we'd all be forced to go to church twice on Sunday and once on Wednesday and we'd be forced to acknowledge JC as our lord and savior.. Stem cell research would be in the toilet and all schools would teach creationism while any mention of evolution would be punished and gays would be persecuted and books such as Tom Sawyer would be banned. The world would be flat again. That shit cannot and will not be allowed to fly in this disparate society
In the 1950s I lived in Connecticut. That state was largely catholic and it was absolutely illegal to sell any kind of contraceptive. If any such product was wanted, the only option was to drive to the nearest other state. Citizens were obliged to take a lot of cold showers so as to regulate their libido. What the hell, the pope was, and is, infallible, right? The state came to their senses eventually.
Frank, your premise is interesting but I fervently hope that no state sanctioned, adjudicated, and certainly not required religion will ever cast its ugly shadow on our government or its' people.