There are so many holes in your scenario from what I see.
God is responsible for the existence of life in our universe and has a long term plan for us.
This being in a parallel universe, it is also governed by the laws of physics that establish his universe, right?
Did this being ONLY create the living things on a single planet in our universe or did the being create the entire universe (e.g. planets, galaxies, blackholes, etc.)...? In other words, did it create everything or just the living organisms on one planet?
Because these two universes are interconnected God is able to subtly speak to the hearts, minds and imaginations of humans
How? How did this being communicate all of that information about Jesus? Through some kind of magical ability to communicate or does the being have some super technology that it is able to do it with? - because if it's a technological ability and this being is also bound by a set of physcial laws, then none of this is supernatural.
However, in the middle of time He chooses one man, namely Jesus, to perfectly embody His heart for us.
We would need to know how this is done. Again, if it's just technology then it's probably super cool but not supernatural.
From God’s perspective it is all natural, and if we had perfect knowledge of God and His parallel universe it would all appear natural to us as well.
One last question. Is this being that you are calling a god, living in this other universe, is it just another evolved biological organism that has reached a level of super technology that is able to create universes and set in motion the laws of physics? Because if it is, it's super cool but not supernatural.
- Oni