Please give a few examples of where this has happened.
Um, my high school?
The teacher instead of stating the facts about darwinian evolution insisted that it was the means of creation (which to hear evolutionists speak is a sepearate but related issue), that nothing else was possible, and required students to be tested on that.
He was also holding out hope that any day now the experiments with rna-like soup would yeild DNA.
This happens ALL OVER THE PLACE where activists athiests refuse to keep their religion out of the class room.