It kind of seems like the difference in personality types would account for how skeptical people are to a degree (ie whether or not they would believe in gods, witchcraft, etc) and I guess genetics and environmental influences would affect someone's personality type and also I think stress could cause someone whose normally sane to lose it/start being delusional or something. I'm not sure if "personality type" is the right word to use here..
I mean, I know some people who are really really gullible, they seem to believe stuff in a really unscientific, careless way without much thought, like I had a friend once whom we told there were spider-wasps (an insect that was part spider/part wasp) made/discovered on the planet (This was just something from the tv show sliders) and she believed us right away and I know other people who are really really skeptical. Both her and her mom seem like really gullible, unscientific etc people but her brother seems incredibly smart, skeptical and scientific, he was actually the one who told her about the spider-wasps lol I mean, she (the girl we told about the spider-wasps) believes she's seen ghosts in the past, and believes humans were dropped off by aliens as an experiment...I could go on but both her and her mom seem to believe a wide variety of stuff in a very unscientific way...I don't know how much genetics affects that. Her brother's completely different and very scientific and skeptical, so, I don't know, but her brother's definitely related to them