An idea that emerged from my theory of consciousness is that all souls must be tethered. It has occurred to me that souls that have left their bodies are probably stringing along in some alternate space (spirit space, if you will) in a kind of timeless limbo.
For clarity on this topic, see: Saurian Dualism
Eventually, we will have the ability to construct a fully functional human body complete with a human brain. However, I have speculated that such a brain will not function as expected because no consciousness will attach to it. This brain will have the same probabilistic elements built in that all human brains have, but since there will be no soul guiding it, the brain will behave odly. This oddness may manifest in many ways. Perhaps it will manifest as something similar to autism or catatonia.
Eventually, as artificial intelligence progresses, we may develop the ability to make exact reconstructions of bodies and brains that have lived in the past. There is evidence that the information exists in the universe to reconstruct these old bodies exactly as they were before. If we do this, the old souls may recognize their old “template” and reattach to these new bodies. In this way, we will resurrect the dead.
At first, we will probably resurrect only recent humans. However, as we learn more, we may resurrect humans that lived in the past and even the distant past. Eventually, we may resurrect every conscious being that has ever existed in the history of the world, right down to mice and insects.
Indeed, we will quickly recognize that it is a moral imperative to resurrect every soul that has ever lived, because these souls are stringing along in spirit space waiting to be resurrected.
We will do all of this in combination with reconstructing the universe to make it “safer” and more friendly to our chosen lifestyle. This will be the culmination of the Kingdom of Heaven.
spikosauropod 
Interesting take but what about the question of a “higher power”, the One that governs the souls, where role does He/She play in this resurrection process? Was this their plan for souls detached from their bodies? What of the concept of Christian Resurrection and the fact that these souls are held somewhere they/humans do not have access to “reattach” them?
This is actually just a leaf of a much larger theory:
https://spikosauropod.com/2018/12/24/saurian-dualism/
My guess is that a higher power set the system up so that resurrection would ultimately be possible in the way I have described. The higher power cannot intervene directly because to do so would have catastrophic effects on our space. The universe seems to be sort of like furniture from Ikea. The parts are all there, but we have to put them together.
If I am correct, it will probably be possible to restructure the universe in its entirety so that it conforms to the concept of the Kingdom of Heaven described by Christian Doctrine. It is also possible that the restructuring of our space will ultimately make it possible for a higher power to step in and complete the restructuring.
Jesus did not come in the way that the Jews expected, and the Kingdom of Heaven may not come in the way that Christians expect. Moreover, God seems to like doing things through the medium of human endeavor. Consequently, he had Moses lead the Hebrews out of Egypt instead of picking them up and dropping them where he wanted them. This may be another example of that paradigm.
This is all speculation, of course. The possibilities are limited only by one’s imagination.