... to acknowledging that our universe is contingent? Matter doesn't have to be this way: in fact, the matter called "our universe" doesn't have to be at all... (see Aquinas's 3rd way for more). And don't the various hypothetical universes have to be individuated in some way? (I dunno, but it seems so). That is, don't they have to have something different about them: otherwise, there would be no explanatory gain in positing them.
Commentary and discussion regarding science, faith and culture by Leo White