There are all kinds of idiots. Those who read the whole bible as literal truth (or the ones that assume that Jesus was a caucasian who rocked a wild blond hair and beard) are not that different from the ones who read The Da Vinci Code as if it was the Gospel (oops).
Rather than trying to 'disprove' a book the truth of which even the Pope points out is more allegorical than literal, I'd say the problem is with the people who read it literally. You could make a similar argument about guns:
"Guns have been killing people in the past. Guns are killing people right now. Therefore, the best thing to do is ban them".
I love it, guns are the new Hitler :) I'm only missing a car analogy here.
If there were no rational counterbalance to the Bible, how would you tell the difference? Are you advocating that everyone should accept or believe only what they themselves can prove? That way lies madness, too. I've talked to people who believe that gravity exists but evolution doesn't exactly because of this.