So, I'm not religious, so obviously I also don't believe in original sin, but I do like the stories and myths of religions (note: it's organized religion I don't like, and to be honest human organized anything I'm pretty skeptical of).
And one such story is the story of Prometheus. In Greek myth (or at least one of them, there's multiple variations) Prometheus is a titan and a bit of a trouble maker among the gods. All of these different animals had been created, but among them were humans, who didn't have fur to protect them from cold or claws to fend off predators. So Prometheus decides he's going to steal fire from Mt Olympus and give it to the humans. But much more than fire, he gifts them the knowledge of the forge and metalworking, the gift of technology. Through this, humans expand their knowledge and start to grow more powerful, of which Zeus is upset, fearful that man may become as the gods, and so punishes Prometheus by chaining him to a rock and having an eagle eat his liver every day.
Obviously this story is good for humans, the trickster Prometheus is a hero to mankind, and in the Greek tradition was revered as an advocate for mankind's independence.
So if you take this story, and replace Prometheus with a serpent, and the knowledge of fire to the fruit of knowledge of good and evil... all I'm saying is in Greece they would have built statues to snakes.
While, as said before, I'm not religious, I am a Jew, both ethnically and once in spiritual practice, and in most Jewish doctrine the idea of original sin is kinda bonkers. (Most) Christian belief is that mankind is completely lost and held captive in sin, and completely powerless to change from that on their own. -Only- through the belief in Christ and acceptance of him as a savior can any individual person overcome this. Mankind is totally and wholly depraved and unable to enact any kind of salvation from this, or any hope of free will, without Jesus. And frankly, to a Jew, that's nuts. The Torah teaches the exact opposite, that man is responsible for his own salvation. In Deuteronomy, Moses holds a sermon for his people who are claiming that salvation is too difficult on their own.
(note: I don't know anything about the chabad movement, this isn't an endorsement, they're just the first website that came up when googling for Torah chapters)
Sorry, this is all a tangent, and in the end I don't believe any of it anyway so I really have no horse in this race, I just find the concept of original sin kinda insulting. To me, it reads as a form of control, like when the church doctrine was being formed they had a sudden realization that if people could reach salvation on their own, then why would they need the church? And so they quickly had to solve that problem and force people into dependency on them.