I usually try to avoid the word 'God' if possible because it has because so enmesched with Abrahamic religions and it's teachings that people don't always understand what I mean. To many people, a concept of 'God' that is not external from the Universe is nonesensical.
Whereas to me, the entire concept of "external from the Universe" is oxymoronic (or at best paradoxical), because "Universe" refers to "everything that is".
'God' is to me the totality of everything. It is the Universe or Multiverse and all it's dimensions, realities and realms. There is no ''Creation'' per see, but the purpose and evolution of everything which composes an encompassing , immanent 'God'. It is beyond my comprehension. I don't view It as an anthropomorphic being(s) but I do believe that we can connect with the Higher Reality and that It can manifest to us as distinct Entities, 'Gods' if you wish, to faciliate communication and visualization in forms we can relate to as physical beings living in this reality. That explains the large varity of Gods in many cultures.
Gotcha. This is pretty consistent with modern mystic views, as well as that famous Rig Veda verse: "The Wise refer to what is One with Many Names." I certainly understand the aversion to calling it "God" if at all avoidable; when I practiced Saiva Hinduism (I was a more panentheistic polytheist then), I tried to use Brahman/Siva whenever I could, though I think I slipped up rather frequently.
However, it doesn't really account for the various other beings that have been called Gods, including flesh-and-blood humans (such as the Pharaohs). ...also, quick side note, I capitalize Gods all the time as a show of respect, but in Standard American English, you're supposed to use a lowercase "g" unless talking about a monotheistic deity. I wanted to make that clear in case it was causing confusion.
A more concise definition of a "God" (or, properly rendered, "god") that I've come up with is actually just "anything that's been deified", making it a subjective status rather than an objective quality. A God is a God so long as a group agrees it's a God, much like a President is a President so long as the country as a whole agrees. Incidentally, as agreeing a person is a President says nothing about the quality of the person, being called a God says nothing about personal quality. It's more an indication of how something/someone is
treated, rather than an indication of how something/someone
intrinsically is. So those "aliens with highly advanced technologies" you referred to actually
can be Gods if people agree they are, without losing or adding anything new to their status as "aliens with highly advanced technologies".
Worth noting, however, is one major implication of the aforementioned stated fact that the English word "god/God", though still Germanic (and by extension Indo-European) in origin, came apparently out of nowhere to replace the word "Tiw", which is Tyr in Old Norse and *Tiwaz in Proto-Germanic. One of Woden's Old Norse names is Hanga
tyr, which translates to Hanged God (referring to His time speared on the World Tree). Tiw the God Himself was a Sky God, and likely the original Allfather if comparative mythology is anything to go by, as His name is cognate with Zeus. Heck, the name is cognate with the Vedic Dyaus Pita, which literally means "Sky Father". The very name "Tiw", going off of etymology, refers to the Daytime Sky (but in case you decide to look into this, the word "day" is, as far as linguists can tell, an unrelated word). Hence why the Gods are conceived of as "in the sky", and why "in the sight of Gods and Men" refers to being outside. This could also be the source of the term "
Higher Reality", since the sky is physically higher than us. The Tiwaz Rune is literally an arrow pointing up. Also, the word "Heaven" originally just referred to the sky; the latter word came to English via the Old Norse word for cloud.
And
then remember that Tiw is no longer the Allfather; Woden is.