A soul is at best a description of the electrical and quantum interactions that take place in our brain, a personified phenotype of the sum of these things occurring in our head (and to a degree our eyes, mouth, ears, and skin).

I don't believe in the soul in the traditional sense as it implies that there is one version of me -- is my soul my 9yo self, my 20-something alcoholic self, the self as of this moment, or my Alzheimer's-ridden self when I die? If it's supposed to be a "perfect" version of me when I pass, then it's kind of funny, because my spirit is, in a sense, a version of me that I've never actually met and wouldn't recognize.