Just because the public schools tell kids to capatilize the words God and Bible does not mean they teach the Bible, as for the fact that I have no proof of the Bible I will tell you that I have checked it and can give you facts proving the Bible:
We have put the Bible through 3 important tests of to prove historical reliability,
1.The Bibliographical Test
2.The Internal Evidence Test
3.The External Evidence Test
Bibliographical-
Good rule of thumb is when you are dating manuscripts the closer you get to the original the more accurate. We have 24,633 surviving manuscripts of the Bible, using these we can recreate all but of eleven verses of the New Testament and guess what they match.
Internal-
Just like when a person is accused of a crime, the document is question is considered innocent of Historical Inaccuracies until proven guilty. The fact that the Bible was written primarily by eye witnesses helps add to its Historical evidence, especially since all the accounts match and do not contradict. Plus these men were willing to die for what they wrote, give me a writer today who is willing to die for what he believes bet Dan Brown wouldnt despite the controversial subjects discussed in his books?
External-
During this test you are trying to find some outside group or manuscript that confirms the document in concern, in this case the Bible: Back in the first century heretics, who would definetly be considered an outside group when it comes to the Bible, could not question the reliabilty of the sciptures.
Now this basically covers your New Testament, and do not think because of lack of manuscript evidence for Old testament that it is untrue, Because there were things in placed that protected the O.T. from being perverted: I.E. scribes, back before they were able to print documents, were forbidden to write anything from memory, and if a single mistake was found from their copy to the original text it was burned. More so the Dead Sea scrolls which date back to 125 B.C. was a copy of the book or Isaiah and guess what they matched.
Keep in mind the above proofs dont even begin to get in to Messianic prophecy! So tell me again how the Bible is untruest worth...cause then if need be I can show you examples of Biblical truths. Oh and please show me where the Bible is contradictory because that is one thing I would love to see?