People telling me such things as we actually evolved and the flood is not real was the main thing. I was not allowed to be exposed to any disconfirming information, and was required to leave the room when such concepts were taught in school. Had no one ever told me that, I wouldn't have known those fundamental things were false.
I was always skeptical and had a hard time believing the fairy tales, but I actually believed evolution was obviously false and the flood was obviously true, until others told me otherwise.