SJ,
Better be careful or I'll coin yet another new word.i don't want you to do that - sugammafox was quite enough (and i'm not sure it advanced the discussion).
Did you write this after reading my most recent blog entry:i am sorry to say that i have not read your blog since the last "Why all atheists are ungrateful self-deluding morons" post. Well, i'm paraphrasing.

Now, one of us is confused about what the other one is trying to achieve in this thread, and i'd like to try and remedy that. First of all (in case it's you that is confused about what i am trying to achieve), let me set the record straight about my intentions. i got drawn into this purely for the purpose of disproving the notion that "moral" or "good" actions are incompatible with atheism/relativism. This has, inevitably, turned into a much wider deconstruction of relativism, which i am happy to take part in, but i want to note (for the record) that i have no intention of "proving" relativism here.
Now, in case it's me that's confused about what you're doing, let me try and summarise what it seems to me you are saying, and then you can tell me if it's right or not.
You say that in my view morality is a "fiction", a word that you define as
"something that may be a live concept, existing in our minds and perhaps floating around as a meme, but otherwise having no basis in reality". Although for maximum clarity (because i do not think that everyone shares your definition of "fiction") i prefer to say that i think that
absolute morality is a fiction, for the purposes of this discussion i am happy to agree with you that in my view, morality itself is a fiction as you define it.
However, you then go on to deny the validity of any ethical framework which is not based on an absolute source because - confusingly - you say that an assessment of what is "good" can only be made based on a preference for one kind of outcome over another. You seem to deny that a non-absolute source of morality could yield such a preference.
You want to talk about "what evolution would predict", which i don't mind doing. However, it looks a bit like you and EB think that i have derived my morality
from evolutionary theory, which is not the case. Nor do i consider evolution to be an "absolute basis" for morality. There are some evolutionary explanations for human morality, but the human mind and human society (both fairly unique in the animal kingdom) are complicating factors.
You also seem to be under the misapprehension that i refuse to acknowledge any absolute basis for morality because i am irrevocably committed to relativism. i don't really know where that comes from. Relativism is an implication of atheism, for me. My lack of belief in an absolute standard of morality (be it a divine being or simply a platonic form) is what makes me a relativist.
i understand your objections to admitting a "shared understanding" of moral concepts, but i think that you are missing a major problem with that stance. Discussing the source of our shared understanding essentially means having the absolutism vs relativism debate all over again, and we know from long experience that we do not tend to arrive at any common agreement at the end of it. So, what you are saying is that until we have resolved this disagreement we cannot even discuss moral issues? That makes no sense to me.
At the end of the day we do have this shared understanding, even if we disagree about why we have it. For you to abstain from all moral debate until the issue is resolved (which it may never be) seems a little extreme.
you asking me to adopt terms and concepts as 'shared understanding' without allowing an objective basis for that is as ridiculous as asking me to talk about a basketball and suppose that our 'shared understanding' of the word exists in mere ether, and that it is not grounded in fact by our knowledge of baskets, or balls, and the game we know incorporates them both. That is nonsense.That would be nonsense, since we both know that basketball is indeed based in things which exist in the real world. The analogy from my side of the fence would be you and i discussing what flavour of ice cream we liked but you refusing to engage in any discussion of the relative merits of raspberry ripple over cherry vanilla until i admitted an absolute standard for these judgements to be grounded in.
My position would be that since we apparently cannot agree on the basis for our shared understanding of these concepts, we should allow for that expected difference of opinion in our moral debates. i am quite happy for you to reference morality in absolute terms, even though i may not always agree. There is at least some room for dialogue to occur.
Unless you close it down.
"You answer that, and i