The question is definitely interesting. I'm no theologian either, but I do wonder if that sort of "humanizing" via imperfection would actually appeal a lot to people who already want an anthropomorphic relationship with spirituality anyway.

> Like a time he cured a sick man, and this man turned out to be a crook or something.

Can't resist nitpicking your example, though. If he did this, he'd have something in common with plenty of folks who took the Hippocratic oath. ;) And I bet they'd all say it's not a mistake at all.