You're assuming that physics would be the same in every other universe. Physics works the way it does in our universe largely because of constants, but we don't know why many of these constants exist and we probably never will. The idea of a god creating out universe seems like an obvious explanation, but more likely it's survivor bias. Specifically, the idea that since we happen to live in a universe where everything is just right and so we look at that as a miracle and probably planned. In reality, it's more likely that there are actually an infinite number of universes with different physics where life is impossible, but that means that even if less than 1% of all of those infinite universes is able to support life, there are still so, so many universes in which it was. Many of them being nearly identical to our own, and many of them being so strange and alien that we probably couldn't even wrap our heads around the strangeness even if we had an eternity to study them.