Can We Say "Good" without God?

I've been watching the Hitchens and Wilson debate at Westminster Seminary, Philadelphia (click on title for the link). Wilson says there's no way to call anything true, good, or beautiful without God. Then Hitchens goes on explaining how atheists and people with no religious confession have produced some of the truest, most ethical, and beautiful cultural goods.

It seems to me that we're not saying atheists can't produce objects of the most magnificent beauty, but that there's no way to call them beautiful unless God exists. Anytime we say, "That's beautiful," about a sunset, we're not just appealing to our own subjective sense of beauty. We are also appealing to an objective standard of beauty beyond ourselves. There is a beauty behind all other beauties that makes beauty a coherent concept common to all people.

But what about when people disagree over whether the sunset is beautiful. Well most people agree on sunsets, but when we're talking about a cloudy, cold, winter day or a piece of modern art, we appeal to that God defined beauty when we argue that the day has its own kind of barren beauty or the piece of art is beautiful or not.

When we call something ugly we also appeal to an objective standard that has been violated. When we say Hitler was wrong we assume a moral standard beyond our feelings to which he was accountable. To paraphrase Lewis, we can't posit evil in the world unless we posit an object standard of good beyond the world.