In high school, my daughter had an English teacher who was teaching a class in mythology (that she knew nothing about). Half of the class time was spent on the Bible, comparing it to the standard myths to show how it was easy to see the others were myths because they disagreed with the bible.
My daughter was a practicing Wiccan and one of her friends and classmates was openly Jewish. The teacher STILL made comments like "we're all Christians here..." I gave her permission to walk out of the class if it continued.
The teacher ended up having to taking an extended sick leave for the rest of the semester for surgery. The temp that ended up teaching the class admitted not knowing much about the subject and my daughter ended up helping teach the class.