I went to a religious highschool, and at the time I was (shocker) a teenager. You could sign up either for religious education, or for Christian classes. Me being an atheist (and, I stress again, a teenager), went for the least terrible option.
After the first guest teacher came in to talk about their own religion, we got a new rule.
"Students are not allowed to ask more than 5 questions each to guest teachers".
One class later that was changed to
"Students are only allowed to ask 3 respectful questions to guest teachers"
That rule was then dropped, and I get a stern talking to explaining that I, personally, was allowed to ask only a single question during religious education classes.
And then I didn't have to follow those classes anymore, which was nice. But with a couple of years of maturity on me, I feel like I could have been nicer to the poor guest teachers.
Man, I loved my middle/high school's religion classes as an Agnostic.
It was a super fancy prep school, so they went all in with the religion classes being 'academic' with the teachers needing a relevant PhD or Masters.
I still remember my very conservative Old Testament teacher writing all sorts of passive aggressive statements across my envelope pushing essays and then begrudgingly giving them A- grades.
The other teacher for NT and electives was awesome though. Instilled a real passion (pun intended) for the material with fun classes that did things like look at early Christianity as a cult and the sociological factors going into it or reading bizarre apocrypha like the Infancy Gospel of Thomas (which in later years I realized was less 'bizarre' and more subversive and probably even satirical).
Religion could be a really cool class, and it's a shame cowardly institutions try to make it "indoctrination by any other name" as opposed to "let's learn about the criterion of embarrassment and Peter's denials."