If time is not truly linear (but linear time is just a function of human perception) then there may be different questions that are more appropriate.
One theory of time is that it is like a reel of film.
If your run the reel forward at normal viewing speed you have human perception.
Needless to say that is not the only possible way a reel of film could be viewed.
> time ... linear
Language fails. Linear against what? Maybe you mean irreversible?
But then I say reversed from what perspective?
For sure our mortal context is INSIDE of time. I think of it like we are moving into the future but turned around facing the past. We can see the past but not go there. We are going into the future but can’t see it.
Getting outside (context-wise, or “dimensionally”) of time, one could move around in whatever space that is, and go back.
The little book Flatland can help here. If time is a dimension, and there’s a dimension higher than that, then maybe some entity is there, and outside of time.
Creationist Christians (those who see God as omnipotent) simply think of it as time having been created by God like everything else.
But you can imagine a higher dimension without that belief, though I find unbelievers very close-minded in general on the idea of any being at a level completely above us, that can see us in ways we cannot, and can make impossible things happen. Like a 3D being in Flatland freaking out the 2D beings. Or not too much different from a human observing a bunch of ants.