I'm a soul man?

Do we have a soul? What do we mean by soul? Soul is defined as the animating and vital principle in humans, credited with the faculties of thought, action, and emotion and often conceived as an immaterial entity. (The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. ) I don't think we have a soul. The reason I conclude this, if I did not have a brain and nervous system then I as a Homo Sapien Sapien could neither function nor have knowledge or memory of who I am. For example four years ago, Terry Schiavo, a brain damaged woman was unable to feed herself and after two weeks she died from dehydration and starvation because her brain and nervous system could not animate her limbs to feed or hydrate herself. Also, Alzheimer's disease shut down the brain activity over-time until the brain cell shrinks and stop signaling the heart and other key body functions via the nervous system and thus the person die. For an excellent presentation on the brain and Alzheimer see www.alz.org. If I am wrong then I don't lose anything except I had an incorrect conclusion. Apologists like Dr Peter Kreeft and Gary Habermas believe in an immortal soul may disagree with me, but what evidence do they provide that is factual. There is no evidence for an immortal separate soul, because if there was then a person with severe brain damage would be unaffected by the damage, they would be aware of who they are and should somehow be able to communicate this. It is a fact that if the brain is damaged or diseased then my ideas, memory, knowledge, identity of who I think I am will change. This is significant because if I am right then I need to live this life because I won't exist as the personality or identity I currently am because once my brain activity cease at death then my conception of myself dies. Think about it....