How long does it take to create time?
What did matter weigh before it existed?
How much space is required to create all dimensions?
How do these questions differ from the question that you ask if everything must be compared to the physical? Or are you stating that either everything physical ultimately needs a creator / or nothing physical ultimately needs a creator?
If nothing physical ultimately needs a creator than I should expect answers to these questions from – well, ultimately mindless causes…
If you move your imagination to include the real world as structured also with the fourth dimension of time, then all that we perceive as existing is of zero extent in time. 8 ft. x 10 ft. x 30 ft. x 0 seconds = 0 space time units. Existing things are insubstantial projections in space-time according to current theory. Like a photon in three dimensional space, will suddenly appear, then vanish from some point in space, ponderous objects appear then vanish from four-dimensional space-time. All that we conceive of existing can be (and was) borne from nothing. Just ask a physicist!