I'm not sure your example proves your assertion. This isn't sarcasm, I simply don't follow your reasoning. I will acknowledge, though, that the scriptures certainly do assert (Hebrews 11:1) the distinction between faith and proof.
I was using the word "prove" ironically. My actual contention was that believers lack not just proof, but also reason. They act certain, but cannot explain their certainty except with self-referential argument. It was this inability to maintain coherence that finally undid my faith.
I see. The Bible is the Word of God because the Bible says so. There's no logic to follow here. So how can people be so sure? As I said, it's because they believe deep down in their emotions, not in their logical mind. You can't be convinced; you have to be converted.
EDIT: What I'm trying to say is that Christianity isn't meant to be intellectually satisfying. It's about flesh and blood, as you can see from the Holy Supper. Christians ritually eat the Messiah to be united with Him.
I was using the word "prove" ironically. My actual contention was that believers lack not just proof, but also reason. They act certain, but cannot explain their certainty except with self-referential argument. It was this inability to maintain coherence that finally undid my faith.