Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;
There is a really good write up and a great discussion going on over at Say Anything. The basic premise of the post is that overemphasizing no law respecting an establishment of religion by the ACLU and like-minded groups, they are suppressing the free exercise thereof.
I have long felt this way, but never put it so succinctly. Go check it out.