It's hard for some to let go of the invisible friend because of the best seller book and all the shrines across the world dedicated in some way to the invisible friend.
Perry even believes the literalness of the Abraham and Invisible Friend story, and dismisses all the literalness of any evil coming from the invisible friend in that same book. Invisible friend can't possibly allow murder and kidnapping of little girls to be raised as sex slaves. He doesn't care if it's in the same book he uses as evidence of Invisible Friend's existence.
As long as people like Perry belittle non-belief and insist that only ignorant belief in Invisible Friend will make a person good, he won't be put away.
Most people know that Sherlock Holmes and Luke Skywalker were fictional people. Virtually everyone outgrows belief in Santa Claus, but they cling to this Invisible Friend.