The philosophy that everything physical is contingent on something else has roots at least as old as ancient Greece. This being the case, how could physical creation happen? It had to come from the un-contingent, outside of all we know. This being, not being contingent/dependent on anything physical is not physical. (Note they couldn't describe what this being is, only what it is not.) This being is only dependent on itself, depends on nothing else, is complete. He is outside space, outside time. He is Creator.