Excerpt from Wikipedia:
http://en.wikipedia.org/wiki/Separation_of_church_and_stateI contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, or prohibiting the free exercise thereof,' thus building a wall of separation between Church & State."
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This is to protect people's freedom of religion, not to take it away.
If we want to make a bunch of laws respecting the practice or mention of religion, we can certainly do so, but don't use the established "Separation of Church and State" as a backup justification, because to make more laws where none exist is to do the OPPOSITE of what that means.