Of course the soul and/spirit exist; as abstract entities. It is our attempt to to determine, or capsulize the essence of our being. I'm thinking, it may be the id.
And speaking of immortality...Does the fact that we will never know death, mean that we are immortal? I mean, think about it...Even if you were in a situation where you are saying, or thinking, "So, this is the after life, I have died, and went to Heaven", (or whatever
) You are still concious. You can not experience unconciousness! Just like when you are sleep, you have no awareness of the time you were sleep, outside of the relatively short period of dreaming.