I need a bit more information on this story. What type of course was this? Was this a World Cultures course? If this was anything but a World Cultures course I would completely agree with the parents. If this was a World Cultures course where all the major faiths of the world are studied than I think the parents are being overly dramatic. In my high-school we had a World Cultures course that covered us all the major faiths of the world, their major tenets, their impact on art/literature, and their historical impact on the regions of the world. Never once was one faith set above the others in this course. If you want to be aware of the history of the world and it's people than not discussing the major faiths of the world is foolish. It all depends on how this course is structured and their isn't enough information in the story to make an informed opinion.