I can logically prove the existence of multiple gods, but not an absolute god. Here it goes.
I want you to notice that when a discussion of Multiverse theory takes place people tend to say, "An infinite number of POSSIBLE realities." vs. "An infinate number of realities.
The word possible holds a lot of meaning in this sentence. This is because it implies that some realities we can imagine do not exist in this multiverse.
Let's put it like this. First let's assume our universe is a computer simulation, and important values have a variable quantity, but the qualities remain the same.
Antimatter = x
Matter = x
Higgs setting = x
Dark matter = x
There's a lot more settings to list, like dark energy, but this serves as an example. You could assume that each setting could have any value from 0-infinate. The value of 0 means it doesn't occur naturally but it can be made artificially.
This means there are an infinate number of POSSIBLE universes based on each variable setting.
Here's where the word "possible" becomes important. Let's assume that the world of Hairy Potter is impossible in our multiverse because no matter how much you change each setting, magic can't work.
Now what happens if you add or remove a setting? You end up with another multiverse. One where Hairy Potter could be real. In fact, you end up with an infinate number of multiverses because you can have an infinate number of settings, or none at all.
This also means that the settings of an infinate number of universes allows the existence of, for example, Zeus. Yes he's off making babies with golden rain out there somewhere.
More importantly, this is where it gets fun. Let's call this infinate cluster of multiverses a megaverse (Thank you Neil deGrasse Tyson). Everything you can imagine exists in this megaverse. The entire marvel/dc multiverse, Hairy Potter, Greek Mythology, and your mind's limits. Literally, your mind's limits. You cannot imagine anything other than saying somethings there.