The Merman's Children, Book Three, XI.
"'...soulless things out of heathendom are not for Christian people to consort with, are they?'" (p. 188)
This is the end of Book Three and of posting for today. (Not before time, says you.)
The introductory Author's Note makes clear that the conceptual framework of the novel is not Thomist theology but medieval popular mythology. Nevertheless, the contradiction is so great that I have to comment. Merfolk exist. That is mythology. They are described as "soulless things." No organism is a "thing," let alone a self-conscious one. If "soul" entails self-consciousness, then the merfolk have, or are, souls.
In any case, they can reason and make decisions. Therefore, they have intellect and will which were meant to be the two faculties of the, supposedly immaterial and immortal, soul. Therefore, by that definition, they already have souls and do not need to be given them.
I now believe that unconsciousness, consciousness and self-consciousness are three qualitatively different properties or states of organisms and that self-consciousness includes intellect and will. Organisms are temporary local negative entropy composed, according to scientific evidence, of mass-energy and of nothing else.
Needless to say, I disagree both with Thomism and with medieval mythology.