I used to be openly Satanist in middle school and early high school. Though 90% of my grade was unitarian, there was a group of ~10 kids, indescribably dumb (celebrating C- dumb), who were devout Christians. There are two moments that come to mind.
1: 8th grade science class, topic is astronomy. The dumbest and loudest of the group raises his hand and asks "So stars don't have only five points?" The sad thing is that he meant it with all seriousness.
2: In 9th grade, I had this painful conversation:
Girl: [Emissary], do you go to Church?
Me: There aren't any local Satanic churches, besides I'm a...
Girl: No, I mean like CHURCH church.
Me: As in Christian church
Girl: Yeah
Me: No?
Girl: You don't?!
Me: I'm a Satanist, why would I?
Girl: But doesn't everyone go to church?
The most recent, and egregious, statement was an overheard conversation between a teacher and a student. The student asked if any black people went to the south to voluntarily become a slave, because you were given free food and shelter and got to work outside all day. That day is the second closest I've ever gotten to murdering someone.