In order to avoid believing in just one God we are now asked to believe in an infinite number of universes, all of them unobservable just because they are not part of ours. The principle of inference seems to be not Occam's Razor but Occam's Beard: "Multiply entities unnecessarily.
J. Budziszewski, What We Can't Not Know: A Guide
monotheism, occams-razor, parallel-universes, universe