Been a Christian for a long time (1989). I’ve consumed copious amounts of ancient mythology and folklore. People who don’t understand that you can read something that challenges your faith and still follow through with better understanding afterwards is the issue. If you read something and it doesn’t make you think deeper about yourself, faith, world, or whatever what’s the point? Those in the church (Christian or not) that tell you that reading something is a “sin” are probably ones that teeter on the edge of losing their grasp as it is and don’t want you doing the same. Most of them can’t explain why it’s so challenging, they just know it’s there.