As for the premise of this thread, ie. that "sin" is both the word for wrong behavior and for an ancient (?) lunar deity, i suspect that this is a mix-up of languages. None of the bible/torah etc. were written in english, and no other languages (that i know of) call the behavior "sin". In german, it's "Sünde", for example. I think in arabic it's "haram".

Whereas i assume that Sin the deity name is phonetic and probably means something completely different in the respective language(s).

Kinda like Shiva has nothing to do with shivering, linguistically...

The biblical concept of original sin is certainly older than the first english bibles. Idk if it's from old catholic times, where it was most likely latin ( "peccatum" ), or even older from hebrew times, for which i wouldn't know the word.

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Is it even a duality? If i look at some parts of the human condition - that even the most fervent believers of theistic religions go through (afaik) - i dare say that god itself seems to torture its creations at times. Of course this may be misunderstanding on my part, as i haven't been a believer in any god(s) after about age 10. Let's just call it an outsider's perspective