A Spirit?

I had a conversation with a girl on Facebook concerning a spirit and an afterlife. She explained to me that she is an Agnostic. She feels that there is no supreme being/god, but she believes that she has a spirit and that there is an afterlife.... I do not have anything against Agnostics. I believe Agnosticism is the last step before Atheism. But this girl sounded so sure that she had a spirit and that there was an afterlife.

Okay, so in order for something to LOGICALLY (NOT IMAGINARY) exist, there has to be a physical presence. Can anyone give me a specific spot in your body where your soul resides??? I didn't think so. Well after I proved that point, she then tried to tell me that it is scientifically proven that your body gives off an aura. I agreed with her on that part. But then she tried to say that the aura is from your soul. (DISAGREE!) For those of you who do not know what an aura is, it is a radiation surrounding a person or object. An aura is given off from your body because of the fact that there is always an electrical current running through your body. (My desk lamp has an aura!) The intelligence of religious/spiritual people kills me!