I find the ''original sin' concept actually originating with St. Paul in his letter to the Romans. He gets carried away with his rhetoric in comparing the 'first man', Adam, bringing death, and the 'second man, Jesus, bringing life.

Actually, even in the myth story, the authors seed to realize that death was simply natural for humans. To prevent it, 'Adam' would have had to eat of that magic 'tree of life'. That's why he got kicked out of the 'garden' - "lest he eat of the tree of life, and live forever".

Thank the good Lord THAT never happened, or our world today definitely would be overpopulated!!