Wow .. You've gone way beyond my pay grade on this one.
My GOD would Have to exist in ALL universes simply because he is or was the creator.
I can only go on what the Bible has to say and that is .. God is the beginning and the end of ALL things .. whether in the Heavens or upon the Earth!?.
Not really, it's easy to explain on an example. Let's build a very simple Multiverse that conforms to the original requirements (that every combination of everything is.)
Our Universes will contain only two objects - the sky and the earth. The sky can be blue or green; the earth can be brown or yellow. We don't need to increase the complexity because as you will see it works the same way for any number of objects and any number of events on the timeline.
We will have exactly four Universes in our Multiverse:
That covers all possibilities that could mathematically exist in our simple Multiverse. You cannot add one more Universe to the set - it is complete.
As you see, the sky in our example can be of only one color or the other. It's to keep the list short :-) But this is also an example of a binary property: it can be this or that and nothing else. It has only two possible settings.
Now you see that existence of God is also a binary property. God may only exist or not exist. God can't partially exist or somewhat not exist. This property is equivalent to choosing between two colors of the sky.
Now go back and count what percentage of our Universes have blue sky? It's 50% - two out of four. Is it a freak occurrence? No, it's just math and logic, as we know them.
My GOD would Have to exist in ALL universes simply because he is or was the creator.
Not really. There are two possibilities, and none of them help you.
Possibility #1 says: God is local to a Universe, just like the sky's color. Some Universes have God, other Universes don't. If this is true then God will be present in half of all Universes, per our definition of the Multiverse. Your statement is incorrect.
Possibility #2 says: God is above a Universe; he resides above the collection of Universes. That's what you are hinting at. But then the existence of the Multiverse is irrelevant and you can't use it to prove existence (or non-existence) of God. That God could create one Universe just for us, or he could create two, or an infinite number of them. Your statement is not proven.
I can only go on what the Bible has to say and that is
That certainly doesn't hurt. However the Bible is not going into the cosmological details. Even if somehow Jesus would spell it all out, none in his audience would be able to understand him - and nothing of that would be written down decades after the fact. Bible was physically written by humans, and as such it contains only what humans could comprehend at that time (not much of cosmogony, that's for sure.) The only record of the creation is in the sky above us.
God does not solely exist “in” the universe or a multiverse.