To explain why we can define God to affirm his existence!

[Esquilax]

The soul is obvious. It's manifest. Most cultures in the past believed in it not because they were stupid or anything like that.

It's because it's perceived and obvious.

Yeah, sorry, you don't actually get to do an end-run around actually demonstrating your claims, this don't work that way.

Most cultures in the past simply mistook a process that goes on in the brain as a quantity. There is a conscious portion of the human person that cannot be found by looking in the body... it's fairly natural to conclude from there that it's some supernatural thing, if you don't have the technological know-how that would allow you to see the processes that give rise to that consciousness acting within the human body.

Essentially, the cultures of the past believed in the soul for the same reason they believed in a lot of wrong, "obvious" things: it fit with what they observed, they just didn't have the apparatus required to observe further and see that this is incorrect. You, MK, live in a time where you no longer have that excuse, which is why you can't even offer anything other than a simpering "it's obvious," in support of the claim.