I don't know a thing about religion or theology, so take this with a huge grain of salt.

But I still don't really buy the accuracy of these numbers for the matter at hand here. I suspect that when asked by a pollster, someone who answers affirmative to this question is doing so because their religion has told them to believe that.

The pollster probably doesn't ask a follow-up question of the form, "C'mon, really?" I suspect the answer would often be, "Yeah, not really. But the priest/minister/religion-dude/whatever says it a whole bunch, plus it's in that book we are forced to read over and over."

People like to have their pet beliefs that they know to be factually incorrect. I like to believe my taste in music is superior to just about everyone else's. But it's not.

Apologies for my sacrilege here if you are religious.