THE IMMORTAL SOUL?

Today we had a brief discussion about consciousness and animals, but I think the real ethical dilemma that plagues Elizabeth and the reason for her deep empathy and concern is the question of whether or not all animal life forms (includes humans, excludes plants) have an "immortal soul". I am leaning towards the opinion, assuming that evolution of animals and humans is historically the same, that all animals and all humans either have immortal souls or they do not. This is idea equates humans and animals, essentially placing them on the same level. So, then, is is morally right to systematically slaughter beings with immortal souls? This is Elizabeth's primo concern. But do we agree? Animals eat other animals, animals have been known to eat us. Is Elizabeth advocating against the killing of all animals, or just the ones that we actively farm? Is farming and domestication morally objectible, even if the process is "humanely" excecuted? What is the difference between domestication and slaughter, if we are talking about things with immortal and feeling souls?