How does Cormac McCarthy use imagery in Child of God?

Bilblical imagery likens the flooding in Sevier County to the great flood in Genesis 6. The characters joke about the whether or not a man with a beard might be building a boat nearby..... another character remarks that the flood is a judgement of sins. In using this imagery, McCarthy likens Lester’s sins to those of humanity and utilizes the flooding as a conclusion to his crimes.