Wow, lots of complicated stuff on original sin. Especially when it is so clear what Original sin is. Genesis 1:29 says that we are given "every seed bearing plant for food". This is the Only order we are given. Similarly, in science protohumans, the Australeopithicus Afarensis, were herbivores. Then they became scavengers and began developing the tools of the hunt, from which came war. Genesis 9:3 clearly indicates that God meant us to be herbivores! and points out the "hardness of our hearts" towards other living things.The evolution to hunting required narrower hips for running, and guess what, this caused women to have increased pain in childbirth. Cause and effect! Original Sin brought down an abundance of ugly behaviors that complicated or lives and made us ignorant of "every seed bearing plant." Herein lies the key to health and peace.After mankind became hunters, they became cannibals and descended into a very long history of debauchery. We would have discovered agriculture a very long time ago if we had not made this choice to go against God.This is what Genesis tells us. We had clear and simple orders at first on how to live. We broke with these orders and then things got ugly; we compounded one sin with many. First was Adam, then Cain and Abel (Homo Erectus and Australeopithicus Robustus) Next Erectus kills Able, and later Seth, the Neanderthals, comes and replaces the one who died.The biblical story and scientific story are two sides of the same coin. You can't get the whole story without examining all the evidence!
