As much as I personally may not be a big fan of organized religion, I am even less a fan of making the state the one and only supreme decision maker, especially since governments are far less stable than religions are. The law of the land must take precidence over any religious practice or anarchy will result.
So a balance has to be struck. People need to have the freedom to practice their religion but not without any constraints. When and where the government steps in is the big debate. Not to my way of thinking. If a so-called religion breaks the law, then they must be held accountable.
I totally disagree that any one who has a religious belief that conflicts with the current laws needs to leave the country. This country was settled in part by people fleeing that kind of thinking. In the Texas hill country you will find many remnants of the German people that came and settled there fleeing religious persecution. America was never set up to be a police state and that is exactly what you have if the state determines religious practices with anything other than the minimum of interference. I kind of like "America, love it or leave it." No one is forcing you or anyone to stay. You don't like the laws, the way of life, you are free to leave.
As an example just suppose that the government decided that circumcision was to be illegal. Their reasoning was that it was a medically unwarranted violation of a childs civil rights. So it was now illegal and a felony. Most people would fuss a little and life would go on. But what about people who follow the Jewish faith? First of all, that will never happen. To them it is scripturally mandated and a basic tenet of their faith. If they stop they are disobeying God. If they keep the practice they are breaking the law and could have their children taken away. Then according to your logic, if the FLDS, Amish, or any "new" religion decided that the first born male child must be slaughtered within 24 hours of birth, that would be OK with you, because it is a tenet of that religion?
This is the kind of dilemmas that the "state" has tried to stay away from in the past and they need to do so in the future as well.