By your reasoning, if someone had the religious based belief that 2+2=5, then the public schools could not teach that 2+2=4, because that would be teaching that the 2+2=5 religious belief is wrong.
Moose
Added by edit: The teaching of 2+2=4 being correct is NOT the teaching that the religious belief of 2+2=5 is wrong. It does imply that 2+2=5 is wrong, and the religious believer may infer that they are teaching that 2+2=5 is wrong. But implications and inferrals are not explicit teachings.
Edited by Minnemooseus, : See above.