...when you have people using the word 'demonic' to describe UAP's, things could change.

Well, a very small minority of people, possibly including J.D. Vance (see JD Vance Says UFOs Are Actually Demons thread).
Small numbers of people have always held unusual views (or perhaps more commonly, have briefly proposed bizarre ideas).
The UAP= demons idea is dependent on (1) some UAP actually being a previously unidentified phenomenon and (2) the existence of demons that are objectively visible regardless of the religious beliefs of the observer, neither of which is demonstrated.
UAP = demons is in opposition to the idea that UAP are of extraterrestrial origin in any scientific sense. I think its proponents (mistakenly, IMO) see it as supportive of their traditional religious beliefs, not that their religion suggests, or UAP sightings are caused by, the existence of aliens.

There was even a thought that if NHI are revealed to have superior tech and life, there could be a group of people that start worshipping them as godly beings or their own religion.

Maybe, there might be precedents (now much contested) from history/ anthropology. It's a common theme in science fiction.

There's a popular belief that Spanish Conquistadors so awed the indigenous American populations that they were mistaken for gods or religious/ mythical figures, but it's likely this was propaganda by Spanish writers of the time and later;
"The Mexica Didn't Believe the Conquistadors were Gods", JSTOR Daily, 17 January 2020, Matthew Wills https://daily.jstor.org/the-mexica-didnt-believe-the-conquistadors-were-gods/
Some parts of the Wikipedia article "White Gods" relate to this, https://en.wikipedia.org/wiki/White_gods

The so-called cargo cults (itself a contentious term) of New Guinea and some Pacific islands might be a consequence of relatively small, isolated populations with pre-industrial revolution levels of technology being exposed to "modern" technology (sometimes in a dramatic way, e.g. the rapid construction of a busy airbase during WW2).
However, other factors, not just the technology per se, may have played a part,

External Quote:

Cargo cults were typically created by individual leaders, or big men in the Melanesian culture. The leaders typically held cult rituals well away from established towns and colonial authorities, thus making reliable information about these practices very difficult to acquire

(Wikipedia https://en.wikipedia.org/wiki/Cargo_cult) so maybe some local leaders (in small communities) sought to associate their traditional power/ status with the undeniable power of the nearby visitors.

But even in the areas where these types of cargo cults originated, they were small and not reflective of majority belief.
Some discussion of cargo cults, and arguably analogous beliefs amongst UFO enthusiasts, from post #4 on, "UFO Landing Stations???" thread.

Though I don't have citable evidence, it seems in most cases of people encountering others with more advanced technology, they understand that those technologies -although they may be astonishing or alarming- are associated with their bearers/ users, not religious manifestations.

There have been a number of religious groups/ cults that have adopted ideas from the UFO narrative and from science fiction, e.g. the Heaven's Gate cult (Wikipedia https://en.wikipedia.org/wiki/Heaven's_Gate_(religious_group). Scientology was founded by SF writer L. Ron Hubbard, and contains teachings that many critics think are little different to (not very good) science fiction.

If we ever find good evidence of ETI, or establish some form of communication, we don't know what the circumstances will be or what will happen. The history of our own technological development would suggest that any ETI would have science and technology significantly more advanced than our own: we have had radio telescopes for less than a century, we are not a star-faring culture (although we've sent a handful of probes creeping toward interstellar space).
But the concept of more advanced extraterrestrial cultures is widely known, at least in many developed countries.
I doubt many reasonably well-educated people would mistake evidence of an advanced ETI as being a religious event. Depending on the nature of a hypothetical contact, proof of/ communication with ETI might in practical terms be an irrelevance to many (most?) around the world, although of great interest to many of us.

If some people choose to worship extraterrestrials in the wake of proof of/ contact with ETI, that's up to them. Deifying others on the basis of their having superior technology doesn't seem very sophisticated, and (despite some historical claims) it isn't a path many humans encountering more technologically advanced societies have taken in the past.