Where do atheists get their morality from?

[Boccaccio]

I'm still curious if someone could explain to me exactly what "objective morality" is supposed to be, even in theory.

I have taken it as not subject to any judgement of a human mind other than that the human makes a free will decision to follow the moral rules, or not, in a strict fashion, accepting the moral decisions arrived at by external means or entity. Whether we ourselves judge such moral decisions or their process to be good or bad is of course subjective and not in play.

Is that a fair summary, Atom (in the absence of stephenmills1000)?