It should be noted that the Constitution does not provide for "freedom of religion" (whatever that formulation may mean).

The Constitution includes language to the effect (meaning that I'm too lazy to check my quote, but I think I'm correct) that "Congress shall make no law regarding establishment of religion."

The concept of "freedom of religion" is a quite different thing from a prohibition on the government's establishing an official religion. It's a high value, but it's not constitutional.

Dave Oesterreich