I've been running into this a lot lately, people quoting the bible to prove their point about god or the validity of their bible. All the while they seem to be completely oblivious to the fact that they are committing a logical fallacy. The point I think a lot of believers miss is that I'm not questioning anything BUT the bible, really. I don't see as much of a problem with there being a god of some sort, just a problem with the god of the bible. I suppose you could say that it's the main thing I don't like about Christianity (and the other major religions, really), the fact that it's all based on an archaic novel that was compiled of the course of 1000 years or so by men who's main goal was subduing the masses, particularly the illiterate.
Now one of my favorites is when they quote 2 Peter 3:3-10 or so. First off, 2 Peter is one of the most hotly debated books in the bible (in terms of authenticity and authorship). There's a large group of Christians Scholars that question whether or not it was divinely inspired and rightfully so. The whole book is practically one big band aid used to fill in holes. It was written at a time when Christians were expecting Jesus to return and he hadn't yet, so people were starting to get a little antsy. This particular passage refers to the fact that people will start to mock the bible when end times are near. How convenient, a book filled with fantasies of giants, talking snakes, talking burning bushes, dragons, unicorns, great floods, and people coming back from the dead says in it that there will come a time when people mock it. Hardly prophetic.
Another one I've heard recently is the classic, "You can't disprove it, therefore it must be true," argument. I won't spend much time on this because pretty much anyone can look at this and see clearly it's a desperate plea. If you haven't heard the teacup argument, check it out first to understand why a scientist would simply over look that statement. However, I would also like to point out that by that very same logic, you can not prove that the big bang didn't happen, therefore it must have! In fact, you would find much, much more evidence to support that claim, empirical evidence that you could share with everyone!
In the end, I would wish to put to rest the idea of proving the bible, via the bible. It's an outrageous claim that would not hold any water in a scientific debate. If you have other facts, or proof, I would love to hear or see it, but please stop quoting the bible to prove it's validity and thereby perpetuating this grandest of circular arguments.