Actually that is the position of God going back to Genesis.
Adam and Eve's disobedience to God was their sin. It's why they were kicked out of the Garden and condemned to death. It's why God instituted the blood sacrifice to cover their sins. It's why Jesus is the one-time final sacrifice for all of our sins...past, present and future.
I think the concept of what Original Sin IS has evolved.
Original Sin is called “sin” by analogy. It is the absence of grace and a deformation of human nature, which, with sufficient maturity, leads to personal sin
And there's your problem....original sin is not sin by analogy nor has it evolved. We are all born with a sin nature as a result of the fall in Genesis and as a result we are all sinners or Romans 3:23, and a whole lot of the NT is not valid.
Even the little baby and small child is still a sinner though they may not know it.
Just so no one is misled:
Adam and Eve’s first sin was NOT Original Sin. It was THEIR PERSONAL sin.
Original Sin is the “sin” WE are conceived with. It is not personal sin. It is called sin by analogy precisely because it is NOT personal sin, but it leads to the commission of personal sin long after conception and birth.