My own sense is that there are good and bad ET's AND good and bad angels--the Bible being clear on the latter . . . bad angels now called demons.
Scripture talks about satan being CAST DOWN to the earth. Who knows how many galactic races he influenced after his rebellion against God and being cast down in an imprisoned way to earth.
My brother was insistent that we had our own fleets of UFO craft both that carried people and that went under computer control to any spot on the globe INSTANTLY--as in no or microsecond travel "time."
Some havve written of space/time being warped--drawing the points where one is and where one wants to go--drawing those points together.
One source has written that time is not the same in all areas but only appears so to us because of our CONTEXT. I feel we know that AT LEAST time on earth is very different form time in Heaven--if time in Heaven even has ANY meaning at all in any conventional sense we could wrap our brains around.
Others assert that there are dimensional shifts that afford short transit times between our area in our galaxy to other areas in extremely distant galaxies. I suppose kind of like falling down Alice's rabbit hole here and coming out a stargate there in rather short order having used another dimension/realm/area of reality entirely as a short-cut.
Others seem to insist that the speed of light is not the boundary we think it is and that at very high speeds things happen or can be made to happen with time which we are not yet aware of.
What do I know. I'm a shrink.
But these options sound at least as plausible as Star Trek does. What's the difference between reality and science fiction? How many authors of science fiction are secret personnel in black projects?