In my view, we should consider the word "timeless" when thinking of God the Creator and "no counting" when thinking of eternity.
Some might be more comfortable calling it a "universal now."
Consider the photon, it travels a "null path" - for the photon no time elapses though certainly observers of the photon (from their reference frame) sense time passing while observing the photon. The photon is in a universal now or a no counting of time. The observers are not.
Likewise, when thinking in terms of universal nows or no counting of time - past, present and future are meaningless. Everything is now.
Space/time on the other hand is a continuum. It is relentlessly physical. There was a beginning of real space and real time and no matter how far one moves the goal post to prior universes, there is always a beginning of real space and real time. That is the poison pill to physical cosmologies except of course for Tegmark's Level IV which is radical Platonism.
Another interesting point is that physical cosmologists presuppose that the physical laws/constants of this universe would apply to prior ones. That is wishful thinking.
Also there is the issue of origin of physical causation per se and inertia for that matter - not to mention space, time and energy.
This notion of different coordinates systems should not surprise a Christian. Daniel Chapter five shows it, as well as Jesus leaving the tomb. Phillip may have experienced it also with the end of his explanation to the Ethiopian. And there are several more examples in Old and New Testament.