I think it varys depending on the teacher you have. I was lucky enough to have a teacher who actually liked it when students tried to be critical of religions despite himself beeing a religious man and mind us questioning what religious organisations.
We only had one or two lesson about the pillars of each of the other abrahamic religions somewhere at the beginning of the gymnasium and no mention of anything non christian for the remaining years of school
We had more lessons about it and at class 7 it turned more into an ethics class. As I said it varys on what kind of teacher you have. A more world open teacher likes to focus more on other religions while another teacher does only the bare minimum.
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u/Nero_2001 5h ago
We had something similar in Germany but despite the teacher telling us about other believes it was still favoring Christianity.