If (cite?) those who call themselves Christians do not nowadays read the Bible, it is not clear why the alleged cognitive hazard did not apply, say, in Victorian times. Perhaps they are merely more lacklustre about their religion.

I think a lot of intelligent Christians don't read the Bible for the same reason that a lot of intelligent atheists don't try to become very conversant in modern physics. The Christians think that they are lucky enough to live in a world with a nice division of labor in place. They can devote their time to other things because people they trust have chosen to read the Bible, and the readers will make sure that the other Christians know about anything really important.