Actually as a Baha'i our physical existence is eternally Created by the 'Source' some call God. Analogy would be as long as the sun (God) exists the shadow (Our physical existence) exists.Yes, that a Creator had to be existing before the universe began makes sense. To me. Obviously not to you or Stephen Hawking. And others.
Except for the fact that Stephan Hawking is atheist/agnostic. His science concerning the nature of our physical existence is right on.