I think a being capable of creating the universe from nothing is quite capable of existing independent of whether such pathetic creatures as ourselves choose to believe in said being. This debate is not very interesting to me for the simple reason that humans cannot under any reasonable philosophical model cause an eternal, omnipotent and omnipresent being to be "dead" any more than they can cause it to be "alive". They can believe or disbelieve in it, as they choose, but its existence or non-existence will nevertheless be independent of what people choose to concoct in their own minds. "I/we/society does not believe in God" does not equate to "God does not exist."
Oberon and Fmw, good points by the way.