Possibility #1 says: God is local to a Universe…
Possibility #2 says: God is above a Universe;
And why not a third possibility?
Possibility#3 says: The existence of God is common to and throughout the Universe or all the universes or the multi-verse, however you want to put it.
Your example of four Universes in a Multi-verse has things common among them. One thing is “color”. It manifests itself in different ways but it is still color. The other thing is “objects”, which manifests as sky and earth.
Because each of your Universes has sky and earth each intrinsically has objects, the sky and earth being a manifestation of the existence of objects.
Because each of your Universes has some binary combination of blue, brown, green or yellow each intrinsically has color in it, the blue, brown, green or yellow being a manifestation of the existence of color.
Is it such a leap to say that because each of your Universes has objects and color that God exists in each of them, the objects and color being a manifestation of the existence of God?
Your possibility #3 is equivalent to my possibility #2, with the only minor difference of where God chooses to be - above Universes or within all of them.
Your example of four Universes in a Multi-verse has things common among them. One thing is “color”. It manifests itself in different ways but it is still color.
It's just an example. You can invent a Multiverse that has color in one group of Universes and doesn't have it in another. I only wanted to illustrate a single bit of information. If you want to be exact, each such Multiverse can be described by the n-dimensional space where each coordinate vector defines the property. Binary properties are quantized and have only two states; other properties may be also quantized, or they could be contiguous with all kinds of distribution.
Is it such a leap to say that because each of your Universes has objects and color that God exists in each of them, the objects and color being a manifestation of the existence of God?
Non sequitur. My toolbox contains screwdrivers and hammers and a measuring tape, but this says nothing about existence of God in it or above it.
The most important - if not the only valid - point of this exercise is to prove that existence or nonexistence of the Multiverse (as in several Universes vs. only one) does not help, theologically, to prove existence of God. God may well be there, as an external observer with a microscope or as an internal observer (like an ether) in all Universes, but the Multiverse theory is orthogonal to that hypothesis.
Perhaps it would help if we prove that Multiverses exist (being created naturally or supernaturally.) Then perhaps we can travel between them and study them. Then if we find certain "signatures" that are common to all of them we can start thinking why is that - and that might lead us to more theories, if not to the proof. But a mere theory that Multiverses might exist doesn't buy us anything at this time.