I think this website has to be concerned with reading the Bible and other religious texts correctly because the WWGHA argument would otherwise be a straw man if it misattributed certain beliefs about God to people who don't actually believe that.
Therefore the Bible at least to that extent is evidence. It is the source/foundation of people's operating beliefs.
I'll agree I can't prove the Bible with the Bible but I can give insight into what a lot of theists believe by using the Bible. The other member asked a question to theists and I clarified what I, and theist, thinks. If you don't listen and try to understand then all you are doing is beating the straw man.
1 - Since you won't even entertain the idea that god doesn't exist, you build your defenses of the bible from the top down, using the loosest connections and justifications to get you back to the top down idea that the christian god exists and is the only true god.
2 - The bible promises in a dozen places that god answers prayers yet there is no statistical evidence that god answers prayers of any kind, that's why the site is called "why won't god heal amputees?". As soon as there's a prayer that can't be answered through coincidence, the same as it'd 'be answered' for any non-believer who didn't pray, then it is never answered.
So god promises to answer prayers but... "won't if our hearts aren't right with god" and since "everyone falls short of the glory of god" then there's a built in excuse for answering ZERO prayer! Yay! Biblical promises come through again.
3 - Christians brag that they have faith and fear god... yet when they make a promise that the Bible makes out to be fairly important, like marriage, they don't keep it. They don't even try to keep it. Atheists have much lower divorce rates than Christians, who then go on to say that they own the true definition of marriage. When christian women want out of a marriage, the bible is so contradictory they easily find biblical support. "There's no cause for divorce except in cases of adultery" and "Jesus said, if you've even thought about another person lustfully, you've committed adultery in your heart" Yay. Therefore 100% of all christian divorces are totally justified! That's reasonable! Yay! Biblical promises come through again.
Everything about Christianity is this... "We promise all kinds of crap until you really need us to come through, then we don't at all! Yay!"
So given that prayer is never answered, and Christians rarely keep their promises to god, why should anyone believe the Bible at all?