Ahh yes, "souls." Great example of one of the web of improbable constructs we invented to support the earlier invented improbabilities.

"When we die we meet God in heaven." "Uh, we don't seem to go anywhere except to worm food." "Well...um...there's an invisible thing that goes to heaven. It's the 'real' us. it's called our...um...soul. Yeah, that's it. And we're the only animals to have one. Ain't we special?"

Cleverly disguised as a responsible adult.