Original sin isn't mentioned in Genesis 3. Only the three characters who comitted sin. And in all likelihood four, because the "god" of this story acts more like a brainwashing devil who uses people as cattle and has zero mercy, did in fact lie about the fruit, and seems to think there is more than one god ("man has become like one of us). Which means he is not in fact THE God, but rather an entity that calls itself a god aka a demon or archon. Internal evidence shows that the name YHWH was inserted into this story later, because it awkwardly says "YHWH God" and the dialogue does not contain it. And if you think that's because they weren't supposed to say it, take a look at Genesis 4 where suddenly it does appear in the dialogue, and the text drops "God" at precisely the same time. Clearly the person who wrote chapter 4 redacted chapters 2-3 from an older version. Probably the same writer emphasizes the importance of clearly pagan rituals such as animal sacrifice (not as a symbol or act of devotion, but to create a "pleasing aroma") and is called out in Jeremiah 7-8, which is unfortunately purposely mistranslated in nearly all Bibles to conceal this. Actually the entire "Books of Moses" are forgeries authored by Josiah, the Israelite temple cult, the priesthood, the Judahite elites, Ezra the goy-slayer, and the Pharisees and Sadducees. No wonder there's such an immense difference in God's character compared to pretty much every other book of the Bible, aside from the "history" books written by the same person who wrote Deuteronomy.