Since anatomically correct humans have been around for 300,000 years according to mDNA, there is more that a good possibility that UAP may not be ‘Aliens From Another Planet’, but from a human civilization(s) from long ago who left due to natural disasters or just the urge to explore the Universe.
Maybe God didn’t just populate one planet or one universe. Maybe another version of Earth is more technologically advanced.
That has always been my belief.
I think that all the depictions of alien craft and the like, that we see on ancient monoliths, is actually humans escaping the planet before some
extinction level cataclysm.