Is it legal for a teacher to push their religion onto his or her classmates?

in world geography, students study religions , come , how people had different religions, but, information. teacher should not saying leading students choose 1 on other. against law/church , state supposed separate in public schools.
if lecture not in world history or type of class that, religion should not mentioned. tell if teachers that. make sure know said, not explaining religion in history class.

such during lecture, teacher keeps talking how let's say, christianity, religion should follow, , other religions/beliefs wrong, , christianity right one.

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