While your explanation has a wayward path, essentially I can see this.
A possibility is that God exists in another universe that on occasion interacts with our 4-dimensional universe. Clearly there is a Bilical world that is apart from our natural world. Modern cosmology with the concepts of hyperspace and parallel universes could account for this.
Yes you got it, There is a dimension between us and God, which is called in the Bible Spiritual dimension. That we can not see, because we are in the physical dimension.
And yes, you are right, we are in the natural world and God is in the Spiritual dimension.
The God that created everything in the creation week of Genesis, is the same God that created the heaven and Earth in the beginning.
In the creation week of Genesis, is this earth age that we live in.
The creation of the heaven and Earth in the beginning, is way before the creation week of Genesis.
When God created the heaven and Earth in the beginning, Was Billions of years ago.
The bible doesn't give us the exact time, When the heaven and Earth was created.
The creation of the heaven and Earth in the beginning has nothing at all to with the creation week of Genesis.
What we do know is, that dinosaurs bones date's back to 6.5 Million of years ago. So this tells us that the earth is just as old or older.
Throughout the bible both old testament and new testament, tells all about that first earth age. Of the world that then was.
Therefore since there was a first earth age, and the earth was there, Way before the creation week of Genesis.