Do Animals Have Souls? The soul is a vague human thing surviving death. Some people stress that only humans have souls. Plato said souls live in the ultimate reality. Western society adopted this idea when Christianity absorbed it. The soul has thrived ever since. Problem. How can an insubstantial soul affect the physical body? The most rational and compelling answer is that the soul is only a belief. Atheists say it does not exist in fact. Thus humans and animals are on equal terms.