Another thought for the cosmic melting pot of supposition.
Curiously I was thinking about this subject on the loo yesterday and was reading through Paul's words about his internal power struggle, in the right that he wanted to do he couldn't do etc because there was another force within him fighting against his core righteousness.
It lead my mind back to the garden of Eden and the possibility that when the death sentence was passed, the inherent state of dying creates within the dying organism a profound selfish desire (sin?) to create continual comfort zones for us to exist in mentally and physically - thus the battle ensues!
How the death sentence was carried out is beyond me. As Gumby quipped - probably a switch.