there's a really good book call Mere Christianity by C.S. Lewis... he was atheist, and some one told him to prove that God did not exist, and in trying to do that, he proved God did exist... That book helped put my doubts to rest... and here's some song lyrics from a song by Caedmon's Call
some times I fear, maybe I'm not chosen, you've hardened my heart like Pharoh, and that would explain why life is so hard for me.
And i am sad that Esaw hated, cry against what's fated saying father please is there any left for me?
Cast out my doubts, please prove me wrong, cuz these demons can be so head strong make my walls fall please prove me wrong, cuz this resentment's been building
Burn them up w/ your fire so strong if you can before I baal, please prove me wrong
I fear, maybe this is all just a game, my friends & my family all play to harness the young & give some comfort to the old
don't let my doubts prove true, draw me close and hold me near to you, keep my still until the day you cast down my doubts... (etc..)