I abbreviated their story to keep my comment short, and linked the full thing for people who want to learn more.
In truth, the reason she was so susceptible to his offshoot of their religion was because she’d been raised believing in the mainstream religion, which he warped a bit in order to gain followers to his cult. She was primed for it because she couldn’t imagine a reality outside of the belief system in which she was raised, and his cult was only slightly outside that and built upon it.
Look up the story yourself, if you like. That’s why I linked it. My quick summary wasn’t ‘too tidy to be true’, and I can give you links to many, many more stories exactly like that one. Loads of normal people have committed atrocities – often against their own children – because their Christian faith told them to. A great many of them weren’t mentally ill until they became religious. Many committed those atrocities because they became convinced heaven was a better place for their children, that demons were real and trying to corrupt their kids, etc. Google it yourself; I’m not trying to filter knowledge here. These were normal people until they became religious.
Like I said, we should be talking about the damage these fables are doing. We should be talking about the damage done by indoctrinating children so they can’t discern reality from fantasy and right from wrong. We should be questioning our leaders when they say morality only exists in their stories, when the opposite is true. This shot is causing us irreparable damage as a society.