Does Atheism Lead to Nihilism?

[Mudhammam]

G. E. Moore argues that you cannot define good (like you can a chair)...
...we cannot define "good" by explaining it in other words. We can only point to an action or a thing and say "That is good." Similarly, we cannot describe to a blind person exactly what yellow is. We can only show a sighted person a piece of yellow paper or a yellow scrap of cloth and say "That is yellow."

http://en.wikipedia.org/wiki/G._E._Moore

Are you really taking us back to Socrates? How exactly does "God IS good" help again?

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You do realize that "goodness" is just a term we use to describe experiences we value more than others, no? And what everyone keeps trying to tell you: it's not exactly mysterious why we can all pretty much agree on basic distinctions between the ideal virtuous person and the very wretched or miserable one.