That's the reasoning I use to disprove parallel universes, that & the fact that at some point we would have discovered how to interact with our other universes, and that at some point someone in that universe would have figured out how to kill all the universes and we should be dead if that were true.
Again...It doesnt matter! If it exists it exists! If it doesnt it doesnt! But if they are...well...oh well. If something created us...whos to say that same something created them?