Time to accommodate the Creator?

Last night I watched the episode of 'Stephen Hawking's Grand Design' (a 2012 TV series) entitled 'Did God create the universe?' The blurb for the episode reads:
Professor Stephen Hawking unfolds his personal, compelling vision of the biggest question of all: Is there a god who created and controls the universe in which we live? To answer this controversial and age old question, Hawking takes us on a journey through humanity's history of appraising our place in the Universe - from Vikings facing down eclipses to the laws of modern cosmology. Using the laws of physics, Hawking argues that the universe can pop into being from absolutely nothing, that there was no time before the creation of the universe and therefore, no room for a Grand Designer.
Apart from its mild hyperbole, this is an accurate summary of the episode. The history of how science has progressively accounted for phenomena that were earlier attributed to gods or God is well known and needs no comment. But the key idea of the episode, 'that there was no time before the creation of the universe and therefore, no room for a Grand Designer', seems odd to me. 

If God created the universe, then he created matter, space and time and is therefore definitionally outside all three, hard though that is to get one's head around (but I suppose no harder than the idea that there was no time before the universe began). And in Christian theology, at least, this is no new idea: the Creator is not part of his creation.

I have tried to imagine why Hawking might think otherwise. I infer (perhaps wrongly) that he assumes all phenomena known to human beings to be suitable objects for science to investigate, and if 'God' is such a phenomenon, then God too must be part of the universe that science investigates. But the epistemological position that nothing is beyond the purview of science seems to me itself an act of faith. My faith-based position differs from Hawking's, and I appreciate his insistence (at the beginning and end of this episode) that he has no wish to impose his view on people whose faith is other than his.