I wonder how legal this is, say, if a student were to challenge it by walking into the class tomorrow and saying it 100 times as soon as class starts. Normally I do not support that kind of disruption, but these are different circumstances, and if it were my child who did it I would fully support them. Let’s see if he can legally drop a student’s grade to a ZERO over this. Then again, “legal” doesn’t mean what it used to mean if you end up putting the decision in the wrong hands.
Well either that or some other Christian reference, such as "Thank you Jesus" or "Jesus loves you professor", or maybe bow their heads in prayer before a test, and see if he tries to "prohibit the practice thereof".
Does the school receive any "government money"?