I don't know exactly, but to be honest, we are but a mass of atoms, and electrical systems that create something that does things, our brain, which tells everything else what to do. That is what we are, and that is all we can ever be. Just atoms that make up cells, that make up tissues that make up organs that make up organ systems, that make up us. What I don't understand is how we can be alive, why are we alive, surely something must have sparked that off? We cannot have just existed, therefore there must be a higher power that made us possible, made life possible.