Interesting notion, dear brother in Christ. All I can say about that is Einstein did show the ultimate convertibility/convergence of energy and mass in his most famous equation: E = MC2....
Beyond that fascinating fact, I'm still not sure that "spirit/soul" can be reduced to material/mechanistic expression without introducing a colossal category error into the analysis....
IF (and yes it is a big if) the speed limit of a realm of reality we have yet to sense is always above C, however, the medium of energy sensing (light and light speed) is no longer bound by the Einstein equation.
C2 is not a real rate for anything in our universe, much less a reality in a continuum where things sensed must have a past-to-present orientation to be sensed. But Jesus stepped from our universe into another realm, with His body, and stepped back from thence with His body. So, there must be some spatio-temporal basis for that other realm.
Every 'thing' (as in any matter) in the physical universe of our sensing is but a pinch of energy, a twist of space, and a moment of time. The ether is the volume of time. Orientation in that volume determines ... well, I should stop there. No sense giving negative nay-bobs more to derail the thread. Re orienting can allow one to 'be' in a 'higher' continuum yet interact with our 'lower' continuum. Only Jesus has done that so far as I can discern from Biblical references.