Best answer here. Soul is more of a high level concept, I’m not a spiritual person by any means, but say there was a fully conscious AI, I would say there is a difference between that and human consciousness, and that would be what I define as the soul. What is that, is that neurons in the head or is that an amalgamation of our entire being? Idk.
I don’t believe anything happens after death, I think ashes to ashes, but I do think there is a spark, something there that we can’t quite quantify… yet.