Damn I really wish I could title the book, it is on the tip of my tongue but I read the same thing.
What I found abhorrent is that the people interviewed in that book, ended up being prescribed meds by good professional Christian Doctors using all means to change their paths from evil. To avoid D&D as it was the devils work.
I would say that those parent's were mentally ill and/or uneducated and that the doctor's were mentally ill and/or uneducated.
Alas, religion.