@rosborne979,
Yeah, I agree, in a way that one's perception of 'sinning' does come, at least partially, from within that person's imagination or whatever it is that monitors or sets his or her individual code of behavior.
I used to say, whenever I heard something that was sad, or too bad - 'Aw, that's a sin...' as in, ' that really sucks', or 'that's a shame'.
So I'd translate that to mean, for me, a sin is something that causes me to feel some sort of dissonance within myself with what I know to be the right thing to do. And I don't think it's always a collectively arrived at moral imperative.
I can think of a lot of actions that our society advocates legally through the law of the land that , if/when I were to participate, I'd feel ashamed or as if I were a 'sinner' for having done- even though I'm told it's what I should be doing.
So to answer your original question, Rex, my opinion is that the knowledge of what each individual considers to be a sin for him or herself, comes from inside.
Although, ideas of what may or may not constitute a sin come from the outside all the time.
And I ALWAYS trust my inner world moreso than the outer world.
*Just an aside, I'm progressive - and I thought this was a great idea for a thread - in fact- one of the most interesting and thought provoking (for me) I've seen on the new a2k. I'm giving it my first ever thumbs up, if I can figure out how to give the actual thread the thumbs up. And I'm doing that even though I think it's a sin (a shame) that you want to lump all liberals and progressives together and attribute blanket negativities to us...(generalizing/passing judgment, etc.) Just a little joke.