Well, the thing I always wonder about with souls is when we started having them.
Not in terms of conception and the fetus, I don't care about that, you can pick any stage you like, but in our evolutionary history
Like, did Australopithecus have souls? Or not until homo habilius? Homo erectus? What about the Neanderthals, did they have souls?
It just seems stupid to believe in humans having souls, but not other species animals, when you have to set an arbitrary number of millions/hundreds of thousands of years of evolutionary divergence since souls came into existence for particular species of animals and only particular species of animals
EDIT: unless you believe all living things have souls?