So if the universe is what the atheist maintains it is, then this determines what sort of account we must give for the nature of everything -- and this includes the atheist's thought processes, ethical convictions, and aesthetic appreciations. If you were to shake up two bottles of pop and place them on a table to fizz over, you could not fill up an auditorium with people who came to watch them debate. This is because they are not debating; they are just fizzing. If you were to shake up one bottle of pop, and show it film footage of some genocidal atrocity, the reaction you would get is not moral outrage, but rather more fizzing. And if you were to shake it really hard by means of art school, and place it in front of Michelangelo's David, or the Rose Window of Chartres Cathedral, the results would not really be aesthetic appreciation, but more fizzing still.
Douglas Wilson on atheism and the results which flow from its preconditions. For more, read Collision: Is Religion Absurd or Good for the World?