I am interested in [4]. If Jesus is God, then how can God be outside of space/time? And if God is omnipresent, does that mean that God is in every human being, so that every human is divine in some sense? How is omnipresence defined, for example, would it mean that as part of His omnipresence, God is in Hell and is present in the fallen angels?
For [5], if God is outside of spacetime, how is it possible for a human who is in spacetime to experience something outside of spacetime?
This might help, although it relates specifically to time rather than space.
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A thought - one that relates to the discussion of up and down, as well.
If you are walking on a path in a valley, your range of vision is limited to your current location on the path and perhaps some of what lies ahead and what behind, depending on the curvature of the path.
Suppose someone is standing high on the mountain overlooking the path you are treading upon. They would have a much wider scope than you because of their perspective “above” the path. Now think of location in space-time as akin to being on a path. Your concept of “now” is, basically, your place on the path. If God is “outside” of space time, it merely means he is not limited to the path, he takes in or has access to the entirety of space time not from the perspective of the path, but more like - though not exactly like - the one high above the path taking in its entirety. That is not exactly like eternity, because even the one high above the path would have one perspective that “limits” him in some sense. Eternal would mean something like having a complete and unlimited possession of all perspectives, not limited by space or time.
Eternity, in this sense, is a “higher” realm in a similar sense to being upon the mountain is a “higher” place from which to take in the activities in space time. Ergo, Jesus “ascended” to his place at the right hand of God.
Do I deny that Jesus did “ascend” to this “place?” No. I just don’t think the “place” is one in some other “spaciotemporal” location. It can’t be because that would not be ascension, it would be “beam me up, Scotty” to the Starship, Heaven.
This also relates to Jesus “coming down” from Heaven and becoming man. He “gave up” his eternal existence at the right hand of God (the “high” one unlimited by space time) and chose to walk on the “low” path in space time as all human beings do. It was an act of self-limitation on the part of the Word of God.