too many people have had waaay too many out-of-body experiences to prove simply that the mind exists without the brain in a form which can be called a soul. It can be called many things truthfully, where it goes after the body dies can only be known by someone who actually dies... though some near-death experiences show that we either go to a horribly awful place or we get to chill out in a tulip feild with everyone we've ever known where there is no sunset and no dawning
I'd prefer the later, which wouldn't really be the later now would it?