Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;...
This message is more of a preemptive strike against creationists who decide to quibble at the words. I have seen some creationists argue that the First Amendment uses the word "Congress", which literally means the second branch in the federal government, instead of public institutions. This means that the First Amendment doesn't really apply to the the state level, which by the way is where public education belongs.
The preemptive strike is this. Look up the 14th Amendment and Selective Incorporation before you make yourself look like an idiot.
Edited by Taz, : No reason given.
I'm trying to see things your way, but I can't put my head that far up my ass.