Several months ago the Discovery Channel aired a television series featuring Stephen Hawking called Curiosity.  Whereas in his book The Grand Design Hawking claimed that God is not necessary to explain the origin of the universe given the existence of physical laws such as gravity, in Curiosity he argued that God could not have created the universe because there was no time in which God could have done so:

[D]o we need a God to set it all up so a Big Bang can bang? … Our everyday experience makes us convinced that everything that happens must be caused by something that occurred earlier in time.  So it’s natural for us to assume that something—perhaps God—must have caused the universe to come into existence.  But when we’re talking about the universe as a whole, that isn’t necessarily so.
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