I do see a lot of similarity between "original sin" and Morgoth's tainting; and I think you are right in thinking that the differences between the two have to do with the lack of a savior in Middle Earth. It must be remembered that the Athrabeth is a very late part of Tolkien's lengendarium, in which he was rethinking everything in terms of a round-world mythology with modern physics in place from the get-go. So maybe part of his rethinking was the introduction of a savior after all! But who's to know?
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