I had a very religious teacher who went on a rant one day about the book 'The Clan of the Cave Bear'. Having read, and loved, the book I was at first very interested in his opinion on it.
He completely misrepresented both the book and the things that happened in the book. I was actually astounded, he very clearly had not read the book himself and got his opinion from somewhere else (this was mid 90's).
I'm completely onboard with ensuring teachers limit how much of their political and religious beliefs make it into the classroom.
OTOH, there was a controversy in the late 90's where a teacher asked a little girl not to wear a "I love jesus" t-shirt to school. Apparently there was a Mexican boy named Jesus in class and it got everyone giggling and was disruptive.
You can understand both sides there, but at the end of the day it's a place for learning and if it's being disruptive due to the students age then it's being disruptive.
So I don't think it's all that simple, but I do think we can do better.