The following will probably get me into trouble, as it has elsewhere:
I reject the notion that a blood sacrifice was necessary for God to forgive our sins. I believe that animal sacrifice in the OT was never required by God but was an influence from pagan culture. The OT prophets declared that God required mercy and not sacrifice.
You don't need to postulate pagan culture to say that sacrifice is unnecessary. I agree that it's not. The prophets were clear that repentance was enough. However I'd argue that the sacrificial system was effectively sacramental, a way to help underline the seriousness of repentance and of the penitent's commitment to it. After all, a grain sacrifice could be used in some situations, and grain doesn't have blood, and sacrifices were also used for the establishment of a covenant. That's another situation where a cultic action helped underline the seriousness of a commitment.
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