A long time ago when I was in college, a friend of mine majoring in philosophy was doing a paper on the subject that one can define an individual in many way, physical, psychological, etc, but cannot do it 100%. This is because there is a spiritual dimension that cannot be determined by analytical means. If your friend want to call this the God Zone it might apply.
Anyhow, as humans think, we know our thoughts are not just physical although some may believe they are only electrical impulses through pathways. Our thoughts often times seem apart from our bodies in the sense they are not a part of our body like a foot or lung is. Therefore many of us conclude that our thoughts are separate from our physical bodies which has implications of the belief in the afterlife. All societies in the past have different words for body and mind. This seems to indicate they are separate. If something is separate from our bodies, then God or a supernatural can be the answer.
Ask your friend to think of the implications.
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