I would suggets that that is because you are unfamiliar with viewing the Universe from the perspective of space-time physics.
I'd suggest the opposite, that though you are trained in such physics, you still are thinking linearly despite what you are saying. Note your next comment as an example.
I'm not sure I understand this. If a creator were to stop 'sustaining', would the Universe disappear? When would it disappear?
Of course it would because God, by definition being outside space-time, has created the universe from all points in time. It seems like you are still thinking linearly about this and hence didn't catch the fact "sustain" and "create" should be thought of as the same thing if you view the universe from "space-time physics" and accept a God/Creator from outside that space-time.
Who knows? If a god operates outside physical laws, how would one even begin to suggest a mechanism?
What are "physical laws"? If a mechanism is involved in doing things within the universe, isn't it by definition within "physical laws"?
In fact, why assume God operates outside physical laws at all? Or more to the point, why assume God operates arbitrarily outside of truth? The God of the Bible is Himself bounded by and works within wisdom and truth. You can separate physical and spiritual truth and wisdom if you want, but from a scientific perspective, it's all the same as both operate within the universe.
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