It always amazes me that people who think of themselves as hard-headed skeptics are so gullible.
They have the picture in their head of what they think should be true, and then go out to confirm it. In this case, going into the section of the bookshop with religious myths and deciding that one of them is the "official" version, as promoted by the people who fit the pictures in their heads.
Yet, sadly, this is a kind of mistake we are all prone to make
That and overconfidence.