Actually, an atheist is defined as one who does not believe in a supernatural being.
Science could never disprove God, or an afterlife. Just like we could never prove it if we were really all inside the matrix, if the simulation is precise enough.
Therefore I cannot say with 100% certainty that there is no God, or no afterlife, but I choose to believe they don't exist. If there were a God who is omnipotent, omniscient and omnibenevolent, the world would be a different place.
And naturally, if we have learned enough about the human brain, and it really is just a computer, we could copy it, like you say. But it is possible that mechanical circuits could never handle it, and that we would need to replicate our biological brain.
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The strength of a civilization is not measured by its ability
to wage wars, but rather by its ability to prevent them. - Gene Roddenberry
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