"Where do you derive your belief?"
Same place. You hold to the literal truth and inerrancy of each word. I don't. And I'm as much a Christian as you.
I don't deny a person can believe in Jesus Christ as their Savior, and know very little about Him when they do put their trust in Him. The Gospel is a very simple message that is very supernatural (in which science has no jurisdiction):
We have unrecoverable flaws that seperate us from a relationship with God. Jesus lived a flawless life, then took the punishment we deserve on Himself so that we can be reunited in fellowship with our Creator. He also publically rose from the dead to demonstrate to mankind that this physical life is temporary and we have immortal bodies we will be resurrected to when we place our trust solely in His accomplishment for us.
The scripture is way beyond science. Science is entertaining and sometimes helpful.