Well Golding assumes that man's natural state is barbarous. Whether he is an orthodox christian is up to wikpedia to decide. If he is, then yes, he does belive in the idea of original sin in the form of Adam's fall from Eden. If this prallel is extended to the redeeming figure (god) then the rescuers who come for the boys are the redeemers. It is almost as if civilized society becomes the Eden from which the kids have fallen, and then a representation of civilized society (the ship and sailors) comes and redeems them (or whats left of them), bringing them back to their formerly civilized state.
This was just off the top of my head...I haven't even glanced at the book in 4 years, but hope that helps!