The Hebrew word for "sin" is zimah, which is not in the original text, but really it has more to do with the fact that in other places where the Hebrew word "to-a-vah" is used, the practical application is not so severe. As Giga pointed out, the same word is used when forbidding the eating of shellfish, but you don't see Christians all up in arms about people eating shrimp. The eating of shellfish renders one ritually impure, but it is not necessarily a moral infraction.

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