And do believe that I, this random guy on the internet has a soul
I personally don't believe that I anyone else has a soul. From my standup I don't se any reason to believe that our consciousness and our so called "soul" would be any more then something our brain is making up.
I wish there was an active philosophy community on lemmy. I kinda miss r/Askphilosophy and r/askhistorians.
And to answer your question -
I don't really know. I guess people belive in souls so as to eternalize themselves and thereby reducing their fear of death, knowing that their soul will be out somewhere instead of the idea that they will return to a state of nothing.
Yeah, I'd also really like a active philosophy community. The ones I found around here also didn't seam to do question asking, more "hey, here is a interesting read".