Have you all forgotten American history?
The number one reason people came to America and settled in the first place, was to escape religious persecution. What took place in that High School was state sponsored religious hate speech. It was no more acceptable than it would have been for someone to give a speech attacking homosexuals and their lifestyle.
What's really sad about this, is 90% of those on the left who don't take issue with this, would have raised hell if that guy would have attacked Islam instead of Christianity.