Long ago (I was still a believer) my teen age kids, one-by-one, expressed doubts. My wife would jump on them about how "dare they even think that way". I would come to my kids defense. I would "shoosh" my wife and tell her that this was an important passage in their life. They could squelch doubt and become a fanatic or they could decide to develop their thinking ability.
The only way to get rid of doubt is to be brutally honest about fallacious ideas.
Fanatics have more doubt than people who think things through. Instead of dealing with their doubt internally they try to punish the external doubters.
I too, like the phrase "Powerful feelings can be trailer-hitched up to faulty reasoning and hauled off on a trip to Looney Town."