Why should we believe the gospels?
Anything that takes such a massive amount of suspension of disbelief such as the gospels (in both content and process of recording) probably can't be defended all that much.
People who only believe in things they can objectively prove are frankly not getting the whole point of believing in things.
Prove it.
Belief isn't such a provable thing, and I'm not quite sure why you're posting like this in here, making posts that seem rather provoking (for lack of a better term at the moment).
Like, we have The Bible. You and I can pick it up, analyze it, and come to different conclusions. Will those conclusions be based on our experiences before we read its content? Yes, they could be similar or dissimilar. We can prove/disprove things about the Bible through various methods (archeology, cross examinations of secular accounts of an event or person, etc.), and our beliefs may stem from those things.
To continue from that point but to lead into something much deeper, it's what that content says. The Bible is believed by many to contain (well, to give hef his due) some truth about the soul. This is the reality of it. Do we have a soul? That is another belief that, with experience, we cannot fully say...but believe from what we know about what a soul is, or what it could be, what it could be for. The thing is, however, is that it is objective. We do, or we do not hae a soul. There is no in between that I am aware of, or that would make sense. If the Bible is speaking about being saved (read: our souls being saved), that's deep enough to warrant an examination at one's beliefs. Saying "Prove it" is really off base, because what is there to prove. Like PC said, it's missing the point. You take what we know in this world (for example, The Bible), and make your value judgments. And if the soul is there, The Bible may "awaken" you to see something more, something true about God, and that you may have a soul.
In short, asking for proof in dealing with belief is sort of a weird thing. We can prove things surrounding the belief, but we can't prove the belief is true. That's why it is belief.