My sense is that the bible is a literary collection of songs, poems,stories and history written by a faithful people.
The concept of sin had very little meaning for me for much of my life mostly, I think, due to how it is used in many churches as an sword to keep followers in line. I always bothered me because I see some good coming out of forgiveness of sins if it is handled properly. People need to know that they can be forgiven for the mistakes they make. My current thinking on sin is that sins are nothing more than counterproductive mistakes humans make. and Original Sin is humans tendency toward hurtful thoughts and behavior many of which are remnants of our evolutionary path. Lust, selfishness, gluttony to name a few can be traced back to non-sentient animals and served them well in their society but are a problem in ours, so humans fight the urges. That, to me, is original sin.