Where Does It Say Separation of Church and State?

Where does it say in the Constitution there must be a separation between church and state? I believe the Constitution is quite clear in the matter. Yet the judicial system and states have taken it upon itself to create laws and make decisions in direct violation of the Constitution.

AMENDMENTS TO THE CONSTITUTION OF THE UNITED STATES OF AMERICA

Amendment I
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press, or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

I saw an article today "A high school senior in the Chicago area complained to district officials because religious people were allowed to speak at a school-wide assembly, according to the Chicago Sun-Times." The article goes on to say "...God or faith was not mentioned once. The speakers talked about, for example, never giving up, quoting Winston Churchill, Abraham Lincoln, Sir Edmund Hillary..."

The original article said "We had some concerns about separation between church and state, and we don't like these kinds of assemblies being pushed on us, said Soto...” So I'm calling my lawyer? This is insane! Have you ever thought of not attending? (Which he didn't BTW which makes this more ludicrous) I don't like the KKK rallies or message, SO I DON'T GO and I don’t listen!

This is just another result of judges gone amok in this country. We continue to allow others to violate our Constitutional right to freely exercise our religion under the guise of a “politically correct” theory. And we continue to elect these judges who continue to make decisions in direct violation of the Constitution.

My frustration is that we have idly watched a minority of people chip away at the fundamentals that make this country so great. Why do we allow others to decay the fabric of this nation? It’s time for men and women like Judge Samuel Alito Jr. to correct the damage done and enforce the Constitution the way our forefathers intended.

Quoted article - http://www.foxnews.com/story/0,2933,182450,00.html
Original article - http://www.suntimes.com/output/news/cst-nws-lane12.html