"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"
Oh please use your brain for a moment...and try not to distort historical context with your own personal ideologies.
One can only wonder for 2 seconds why this is in the first amendment. One of the main reasons the Puritans left England was because the English government was corrupting the church and bending it to fit the will of the king.
Anyone remember the issue with King Henry? He had problems getting his wives pregnant with sons and therefore would get an annulment sanctioned by the Pope. Well finally the Pope said "No More Annulments". Henry was like "up yours Pope, I'll make my own Church." Thus the Anglican Church of England was born. The puritans didn't like this and felt that religion should not be controlled by a government but by the will of God. So they got a charter to move to the new land of America and left England.
The whole reason for that section in the first amendment is to prevent the U.S. government from controlling a church. There is nothing related to religion being in school. In fact the puritans were actively involved in keeping a life in line with their religious beliefs and actively promoted faith based education. The Puritans prospered because of it, especially when compared to their fellow colonists in the Chesapeake Bay area.