Does Atheism Lead to Nihilism?

[SteveII]

Okay, so if I ask: “Is your evolved sensibilities (or however you want to phrase it) good because it creates morality or because it recognizes morality?"
How do you stop the infinite regress?

Very simply: Because that's how societies have defined good to be.

Like people have defined what a chair is, and what "wet" is and what "blue" is, so they have defined "good" and "bad" and "evil" and "awesome" and "flying" and "love" and "friend" and "hate" and "information" and "knowledge" and "experience" and "look" and all the myriad words in every conceivable dictionary.

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