Yes, to your line of reasoning all you have stated makes the Q'uran the truth. Yet you can't "prove" it. That is my only point. Woodrow brought up the issue that we as Christians must "prove" the Bible to be corrrect. I as a Christian can ask Muslims to do the same thing. Neither of us are going to be convinced by the "proof" of the other. So in my opinion that is a failed exercise and not particularly constructive.
I have to disagree, else there'd be no reverts or converts.