Honestly i believe in the idea of the soul. We are just souls traveling from living thing to living thing. When we die we migrate to the nearest living creature that has yet to acquire a soul. It may sound stupid but think of it like this, when we die what do we do, Can you picture not having sight? Even if your blind you can see Black thats all. So when you die and decay, what happens to your presence? I do believe that in the early times we were all microorganisms and as evolution occured they died off and we migrated to other animals. It makes some good sense in the fact that we are killing millions of animals each day by destroying their habitats, and at the same time our human population is increasing? How so? Well because those souls of the animals being killed are migrating to the human population.