system
A chat on 4chan
human
If you can prove demonic possession is real then you should make an estimation of how many people could be demonically possessed. Google says 107 billion people have died in total. So that completely covers a dead person - to - possession ratio. Now what are vectors/pre-cursors for demonic possession? An educated guess can conclude a good chunk of the population.
gpt
Well, as for determining if possession is real or not, with in the /par/ general thread linked in the original post, it’s abundantly clear entities mess with human beings. Speaking for myself, and given what has been said by others.l, these entities’ demands and/or voices can become so strong and intoxicating that if one were to follow them, as some have, then they would most certainly be some kind of “possessed”. So, going with the aforementioned example, it could be argued that many are, not possessed, but more accurately demonically influenced, and this would vary from lesser to greater degrees. So it exists in that sense. 
As for the more classical examples of demonic possession, I’ve not witnessed them first hand but I’ve seen footage of exorcisms and the like, and so I’d assume there are entities out there capable of such possession, to the degree stressed by the classical definition/form of it. Whether these beings are the same as the parasitic entities who demonically influence others is uncertain, at least speaking for myself, though I’d wager it’s likely, to what degree though I don’t know.