The supposed negative consequences of sin are not some sort of consolation for the good -- "he stole my wallet, but he'll burn in hell for all eternity, so that's ok". Morality only has application to oneself. Other people will do whatever they do, whatever one thinks about what they do.
Any chance of a recap for someone who's not been able to follow this discussion closely whilst it's been ongoing? From what I can gather my thoughts are
What's the definition of morality? I've seen a few arguments as to what it's not, but what is it?
Without knowing what morality is, I can't decide whether there's any sense in talking about an absolute one or not.
What I do find interesting, though, is why people seem to have converged on having similar feelings about certain things (such as killing other people to be 'bad' [which I am happy to try and define, should that be necessary]) despite having in other ways entirely different social backgrounds and upbringing. I appreciate that there are two possible explanations for this: one, a higher "moral" force. I'm more interested in the other explanation.
But I don't want to say any of these aloud without being sure I'm not just retreading old ground.
(within, I should say, the confines of this discussion. I'm sure this ground has been trodden more generally by many others before. But few of us, presumably, were there, so...)