Thanks for this inspiring post. In the light of the Romans passages you refer to I would like to propose the following scenario:
God’s creation of mankind was twofold:
On the one hand God made humans sharing material/carnal/animalistic tendencies and born to die like the other evolved animals in the world, lacking capability to love God and reach eternal life, without awareness of God’s commandment, moral responsibility, and accountability toward God.
On the other hand, he created Adam and Eve of the same material but with special original Grace: they were in a sacred place (whatever that might be) to commune with God, had direct knowledge of God and His commandment, and were called to get eternal life without having to die. As you very well state: “The rest of humanity did not have this”.
As Adam and Eve transgressed God’s commandment, they were not damned to go to hell. By God’s mercy they remained in the world, removed from the sacred space and separated from God (“fallen from God’s Grace”), submitted to death: “the wages of sin” (Romans 6:23). Most important, God granted them the possibility to be redeemed and reach “eternal life (the gift of God)” through the Grace of Jesus Christ (see Romans 6:23), if they freely wanted to.
Thereafter all humans became aware of God’s commandment and God granted them capability to love God and reach eternal life with help of Christ’s Grace , just as “the fallen Adam and Eve”.
From this it follows: After Adam and Eve’s transgression all humans in the world ( including the contemporaries of Adam and Eve ) remained in the very same fallen condition of Adam and Eve, that is, with the animalistic tendencies they had previously, lacking the Grace Adam and Eve had before their fall, but capable of reaching eternal life “through Christ Jesus our Lord” (Romans 6:23). In this sense on can say that “all have sinned” and “death reigned from the time of Adam”, even “over those who did not sin by breaking a command, as did Adam” (Romans 5:14).
This interpretation seems appealing as it would allow us to go along with two (at first sight opposite) views of “original sin”: 1) as the mere state resulting from human evolution, and 2) the fallen state resulting from the first transgression in human history.
I am keen to know whether you may be happy with this “very Romans based” explanation, and also what @gbrooks9 and @MOls think about.