Believe it or not, there are atheists here that compare gods to Bigfoot, fairies, unicorns, leprechauns, Nessie, etc. Shocking, I know.
Now that you've overcome the shock of this news and are settled back down in front of your screen, I have a question...
Personally, I find this to be a logical fallacy: a false analogy, because while there is no objective evidence of their existence, the purposes of these concepts are entirely different. One, in making the analogy, is also applying form to something that doesn't necessarily have form. I also find the comparison rather insulting to those who have had an experience of a god.
So I put it to you. Do you think it's reasonable to compare gods to these creatures? Why or why not?
First some people claim an experience with alien abduction and even big foot.
Second the alien abductions are also having an experience and interpreting it in that way. You have had an experience and you are interpreting it as God. One problem, many people claim experiences with their god told them they were in the one true correct religion. I've heard Hindu, Muslim, Mormon and JW say this. So this raises doubt that you are experiencing something external and simply applying a pre-held belief to a strange experience. Or a mystical experience.
God also has form in stories, he wrestled Jacob and appeared as a human. There are many sightings of Yahweh in the OT describing body parts.
Then, as Greek philosophy becomes popular suddenly God is formless and all these modern concepts. Sounds more like syncretism. If you were in Israel 1000 BCE you would be looking for Yahweh in a chariot over the desert. Now it's a different idea. Cultural.
So this is no different than any supernatural claim and experience. Paul saw a vision, not much different than a fairie sighting in a culture that takes them serious.
If you have an experience of a god ask for some information to bring back with you, something now unknown to humans but will someday be verified. A mystic in the 1800s could have said "light moves at the same speed, time just slows down the faster we move". Or "the universe is expanding, there are billions of other galaxies, it started in a big bang, big suns collapse in an explosion and form gravitational black holes".
That would be a good start. But that never happened. They always say "everyone is one, love is everything". Sounds like endorphins on overload. Which can happen in mystical experiences. Which gave some mystics Brahman and others Allah. Very different concepts of what god is. Not convincing. So you cannot special plead God experiences over ay other mystical or alien encounter.