I wrote this on FB in 2018:
I've been working on thinking of "sin" as anything that is contrary to wholesomeness, integrity, well being, flourishing. All such sin is "forgivable" in the crucifixion/resurrection of Jesus, except something like the refusal of that forgiveness. Unforgivable sin ("blasphemy against the Holy Spirit") would be setting one's "mind" (and that word also needs lots of work) elsewhere than upon the way of God/justice/righteousness, elsewhere than upon the coming of God's Reign. That might suggest that "original sin" is any deviation from well being that is due to what is inherited from the past, historically, genetically, whatever.
This way of thinking would not prioritize volition, but rather *work*, say, the work of a little village of a very few extended families. It would not be about blame or punishment, but about the greater or lesser agony of concrete lived life.
I still think this is right, though a lot of explaining is still to be done. Of course, one of those explanations would have be about "hamartia," the word most used to theologize about “sin,” a word often translated as "missing the mark," but which (if I had the linguistic authority to say it) might be better imagined without fixating on a target, but by thinking of the trajectory of the arrow (or some other project-ile) which may go awry by poor aim or an unexpectedly moving target or unpredictable environmental conditions, like a strong wind or a hail storm. "Sin" in this case is failing to follow the way of God, on purpose or not. (The two guiding sets of texts to be remembered here, it seems to me, are [1] the stories of Israel’s exodus from Egyptian bondage, following a pillar of cloud by day and a pillar of fire by night and [2] the stories of Jesus’s pilgrimage—which he beckons us to follow—that goes out into to the coming of God’s Reign.) In other words “sin” is not about some set of propositional laws that are not to be broken, but of a path simultaneously after God and into well being. What happens in the gospel is that every mode of well being that may be managed by priests and physicians, while still quite desirable, is outbid by a well being “that passeth understanding,” a well being that is not in competition with ill being, not even with death. Moving “after God” is now unqualified, unconstrained by (but, of course, mindful of) the failures, pains, and disasters to which it may lead. Thus the crucifixion/resurrection of Jesus. Thus the words of Martin Luther King, Jr.: “Like anybody, I would like to live a long life—longevity has its place. But I’m not concerned about that now. I just want to do God’s will. . . . And so I’m happy tonight; I’m not worried about anything; I’m not fearing any man. Mine eyes have seen the glory of the coming of the Lord.”