Why god is not real in my opinon

[Esquilax]

There is the conceivability argument, the divisibility argument, and introspection argument, among others. The divisibility argument in a nutshell:

Descartes position on this argument is recalled by Lowe as follows: ‘This is that he, as a subject of experience, is a simple and indivisible substance, whereas his body, being spatially extended, is divisible and composed of different parts.’[5] This suggests that if we were to lose a part of our body that would not necessarily affect our mental states, purely our physical states. It seems to follow from this that if you were to say lose an arm in battle, you would like to believe that you were the same person before and after the amputation, regardless of whether your body was slightly different, suggesting that physical states must be different from mental states. If this holds true, then it would appear that a change in your physical state doesn’t mean a change in your mental state, which means they are two different substances and should not be identified together.

http://vincentwooding.wordpress.com/tag/...-argument/

Here's another thought experiment along the same lines. Suppose you get a heart transplant, lung transplant, frontal lobe transplant and so on until you have replaced every cell in your body. Are you still you? In the process of all the transplants, have you died at some point or continued to exist?

Of course, this doesn't take into account split brain patients:

http://www.youtube.com/watch?v=PFJPtVRlI64

Here's a neuroscientist talking about a patient of his who has a theistic brain hemisphere, and an atheist brain hemisphere. So... you know, aside from being pretty conclusive proof that the mind is attached to the brain in some pretty fundamental ways (it's a physical injury to the brain that causes the hemispheres to be unable to communicate that does this) there's some interesting philosophical questions this raises.

Not that Descartes argument makes much sense as an answer to the question of mind/brain duality anyway; the entire debate is around whether the mind is dependent on the brain or not, so talking about losing other body parts is just a red herring. You might as well say that the foot is not dependent on the body because if you cut off a hand, you still have two feet!