Theres actually no proof, any of the books of the bible could have been made up, theres no proof that the authors, actually had proof of what they saw, maybe they were ticked off about something that the hebrews did, maybe they were trying to make a cult, or split off like the catholics did from the rest of the christians. Theres also reason to believe that mary was jesus' wife. And also why is there different versions of the bible? Why if it all came from one book, then why is there different verses?
I was once in your shoes so I know exactly what you're saying when you talk about "proof." Its so much easier to be on your side and disprove the Bible than it is to be on mine and try to prove it. But that's the good thing, its not my job to try to prove stories to you - I just tell you the truth and pray for you, and the rest is up to you and God. There are many historical documents that we consider to be "proof," or facts, of real events that happened. How do we know they are real - just because people wrote about them and we read it and believe it to be true. Nobody ever really questions a history book, do they?
Also, the Catholics didn't split from the Christians, in fact Catholicism is a branch of Christianity..
.its just that a lot of Baptists don't think Catholics are "saved." That gets into the whole denominations thing which I don't really like or take part of, the only label I like is Christian. As far of different versions of the Bible, that is because the Bible wasn't written in English, it was written in Hebrew (Old Testament) and Greek (New Testament). So its hard to get a translation, a direct word-for-word translation from those languages to ours.