That's the same reason children in many remote villages believe in witches with the power of the evil eye or other evil powers. Everyone around them takes it for granted that witches are real, behave exactly as if witches were real, point to things like blighted crops and unhappy 'accidents' as evidence of the work of witches. It's not surprising when they still believe in witches when they grown up.
I'm not anti-Christian. I'm anti-stupid.