This is a recent post by Jeana Jorgensen, who studied folklore under Alan Dundes at the University of California, Berkeley, and went on to earn her PhD in folklore from Indiana University. She addresses the issue of censorship in education.
Also, consider this, because all religious people don’t look at this issue in the same way:
If questionable content makes a book a target, should the bible be banned for such things genocide, etc? Spoiler: Of course not!