My understanding of the 'general' principle is that if your particular beliefs are that the Adam and Eve story is literal, then you believe they were created perfect.
However, there are some discrepancies regarding what perfection means. Generally it means, they had Gods grace / undeserved kindness / gift of living forever either in a metaphysical or physical way. They lost this grace when they gave God the finger.
Then Christ comes along, metamorphosises and gestates in Mary womb, and is born outside of the cycle of a father who's father's father had given God the finger. He essentially has the Grace. Then dies, without giving God the finger, allowing for the rest of humanity to also obtain that same Grace.
My advice is, if you take this story as true, then try not to analyse it too closely. Choose a simpler subject like the "granny paradox".
steve