Theory vs. Fact vs. Opinion vs. Truth
I did indeed mean that there is no objective moral reality.
I don't think this necessarilly follows from the things you've said. Or, if it is true, that means you lose any basis for judging what someone ought to do and you're again left with the unsatisfying business of self-interest and in a position of undecidability imposed by relativism. I'm not suggesting that there is any sort of externally imposed Good (i.e. god) - and I'm not sure I see how serving the larger organism is any different than serving god (in fact, I think it's precisely that close similarity - the serving a higher purpose - which can make the superorganism notion so appealing). I am suggesting, though, that in order for there to be a meaningful morality there needs must be an objective principle by which acts are judged, i.e. we must define Good and make sure it is in all cases in accord with reality.
For me, that principle resides in the celebration of the individual if you will, rather than subordinating that individual to a larger whole... I like to say "everything is local" and that would include morality. It is not found in the existence or purpose of something 'larger than ourselves' (which is rendered meaningless as, in my reading, you point out with your questioning of god's worth and denial of a grand scheme). Rather, Good is found moment to moment in our state of being; or more accurately perhaps, Good emerges discretely from interelational states.
Meaning and value cannot exist beyond the framework of man's mind.
I would disagree. Things exist in relation to one another whether or not they are conscious. That relation is meaning.
A. Greimas worked this out into a formal system of semantics by which you can define anything by its state of relation to its associated (i.e. semantically adjacent) concepts. The basic form looks like this:
The really nifty thing about that, I think, is that meaning is formed in terms of intensions (sic) and is idependent of arbitrary symbols and, esp., is free of any particular manifestation of that meaning: truth beyond fact, i.e. the meaning would be true in all possible worlds - and that gives you objective meaning that is also internally generated.