Entropy can only increase as time passes, so it's true that there can never be a 100% identical copy. But we don't need a 100% identical copy to continue our consciousness. My original argument was that consciousness is a mechanism derived directly from the brain, much in the same way artificial intelligence is derived from computers. It is a processes. A continuing mechanistic process of electrical signals and chemical reactions. Therefore, all we really need to do is to continue this unique mechanistic process (it varies person per person - this is what gives us our unique personalities ... I will explain below) in order to maintain consciousness. Our brains are a very dynamic system, and they only get more complex as time passes. We wouldn't need to duplicate our brain atom-per-atom in order to insure we have maintained the original consciousness because there is no such thing as an original consciousness. Our consciousness is a process who's algorithm is partly defined by our subjective experiences and partly defined by our genes. Consciousness doesn't carry with it any identity unless if it is subjected to experiences and memories. Therefore, with the exact science and technology it would be theoretically possible to upload your mind.
No, it is not made up of specific atoms (I should have been more specific). Consciousness, as I have explained above, is a process.
I'm pretty sure both of those are possible
Cells regenerate and have a life cycle indeed, but they belong to a much larger system, your body, which remains active thanks to its cell's lifecycle but has its OWN lifecycle.
I have to disagree. Our body is a system, true, but our consciousness is a process which is derived from this system. We are what we eat because our physical bodies maintain the continuation of this process. lol ... I should have been more clearer in my previous post.
Of course this is all coming strictly from my materialistic perspective. I have to admit, I'm a reductionist, all complex systems can be completely understood in terms of simpler constituents (much like in chaos theory, where something as small as the flap of a butterflies wings can generate something as complex as a hurricane).
share your views with a biologist - they'll die of laughter.