"None of you think the major religions teach some insane things? Okay then." I was on the phone so couldn't type much, but my point is the concept of the colle

"None of you think the major religions teach some insane things? Okay then." I was on the phone so couldn't type much, but my point is the concept of the collective cognitive imperative (much better explained in the book than in Wikipedia, to be fair) would answer your question by saying "it's not that nobody thinks that: it's that enough people accept those insane things to the point that 1) they don't think they're insane things, 2) you'd be an outsider (or even considered insane) if you point out the fact that they're insane things. I'll try to give an example that would work in my cultural context (South America): someone making a rain dance during a drought would be considered by most to be something from harmlessly silly to crazy. Someone praying to the christian god for guidance or help would be seen as normal.