I concur with OV.
We humans seem to like to think that we're so f*cking special, and we need souls or spirits of consciousnesses or whatever else connected to us floating around on some other universe or plane or world or ethereal space to explain how we've come to be so very special.
why is it not enough to accept that nature is bloody complicated? I think it's because lay people have no idea how things really work. How does your body really work? How does DNA work? who "reads" DNA? how does one's metabolism really work? Whenever we're told about it, it all seems kind of science-fictioney. So there may as well be a portal to another world in our brains.
'wing, you claim that it's not about the importance of humanity, but it IS. You didn't just go eenie minie miney mo, I'll choose to speculate about the human consciousness existing on another plane, rather, than, say, speculate about whether mice are really super intelligent pan-dimensional beings who've come to study us - that's obviously why they're in all the labs. Free cookie for anyone who gets the reference.
They are both silly unfalsifiable theories for which there is no support. They are, in my mind, equally silly and pointless to argue about.