Fundamentalist ideologies act like mental parasites.
www.psychologytoday.com
In moderation, religious and
spiritual practices can be great for a person’s life and mental well-being. But religious fundamentalism—which refers to the belief in the absolute authority of a religious text or leaders—is almost never good for an individual. This is primarily because fundamentalism discourages any logical reasoning or scientific evidence that challenges its scripture, making it inherently maladaptive.