Reply #11: I'm not a Constituional scholar, but...

[TreasonousBastard]

It all goes back to the school prayer case when Madeleine Murray got the Supremes to agree that a required prayer in public school was an "establishment" of religion.

That ballooned into a vast amount of litigation that essentially said that the government should not express any endorsement of religion of any kind any how.

I used to have a ton of bookmarks on this in an older browser, but they got trashed. Here's a good primer on the whole thing I somehow kept:

http://usgovinfo.about.com/blschoolprayer.htm

It actually discusses the 10C's, and has some interesting things to say.

Then, some judicious googling and searching law school sites brings up more than you ever want to know about the subject.