Guy Threepwood
Mighty Pirate
It's difficult to comment on "multiverses" because the term is used to refer to a whole range of conjectures that range from fairly straightforward interpretations of what is already established theory, though to guesswork that is little better than science fiction.
But that leaves you with a 'someone' who is totally unexplained. So what have you actually explained? All the difficult questions didn't get answered, they got moved...
There are 2 separate difficult questions, how did something physically come from nothing- which is a wash and a moot point because we are here- the score is 0-0: where did God come from? where did the Multiverse come from?
The other question is how all the precise information, engineering needed for us to be having this conversation came to be arranged as such. Including the literal digital code running the software of life. This is not a wash;
because we already know for sure than creative intelligence can design and create such novel and complex information systems, and seed them in a self extracting archive of compressed information, just like the primeval atom
Whether or not this can happen entirely accidentally, it's a far more difficult logical question when we forbid the involvement of ID at any stage.
It's difficult to comment on multiverses because they are inherently philosophical speculation, entirely beyond the scope of scientific investigation by their nature.
They are based explicitly on the rationale, that the only remaining way to create a universe like ours without ID, would be an infinite probability generator, that can and will create anything and everything, including this universe eventually.