Thanks all for your comments. I call atheism a belief system because it requires a system of other beliefs, like evolution for example, to support it. Where we come from is a core relevant question that's been asked for millenia - whether or not fire breathing clowns exist somewhere isn't, and non-belief in those clowns doesn't require a supporting system of beliefs and isn't core to our existence.
I can't get too exercised about the whole issue of "is atheism a belief," because it's largely semantics to me, but I do take issue with this whole idea of what does -- and doesn't -- need a "supporting system of beliefs."
I reject the implication that an atheist has to be able to explain every damn thing about the universe. Theists certainly don't. They offer non-explanations, usually by defining the problem away. ("Humans exist because God created us. How? Well, He just
did. He's omnipotent and can make anything happen." "How did God get here? Oh, that's a silly question because He's eternal. Don't ask how I know that; I just
do.")
What's particularly maddening is that atheists get blasted from both directions. When we point out that there's an excellent, well-supported scientific explanation for X, the God of the Gappers just say "oh yeah? Well, you haven't explained Y yet!" (For example, let X = existence of humans on Earth, and let Y = existence of the universe.) Meanwhile, they haven't offered any evidence for their position other than to point to the (steadily shrinking) list of things that science hasn't yet explained. Yet at the same time, theists (often the same ones!) make snide comments about how "atheists think they know everything!"
This is all off topic though.I went to the biological evolution page and read it - thanks again for the link. It was educational and I agree with a lot of it, but it still didn't answer my questions:1. Why can a human evolve and a computer can't? What's the difference?
To the answers you've already received in this thead, I'll add:
a) because living things, including humans and their ancestors, reproduce through a mechanism that allows for very good, but not perfect copying, and live in an environment that allows for differential rates of survival. Computers don't "reproduce" at all. There's nothing for natural selection to work with.
b) we have evidence of human ancestry, both from living species that show evidence of common descent, and from fossil evidence. There is no such evidence for computers.
2. Why do we reject random chance for a computer coming together but accept that very notion for humans? What's the difference?
Again, you are still missing the most important aspect of evolution.
It is not random chance. Wolfman explained it very well, but I'll just add that certain random events (i.e. mutations) provide the raw material for natural selection, but it is non-random factors (i.e. differential survival) that make it "work."
I'm going to steal a good explanation and example from
someone's blog:
And the misconception is, in a nutshell, that it is not "Evolution by random chance", rather it is "Evolution by natural selection" - and natural selection is a completely non-random process. Darwin's named his book: On the Origin of Species by Means of Natural Selection.
Let's take the small scale example of the flu virus. Every year we encounter a new strain of the flu virus that beats the flu vaccine. The misconception starts when we think that the flu virus evolves into new strains deliberately with the explicit purpose of beating the flu vaccines that its host (we humans) administer. Now it is extremely dumb to think that the flu virus knows about the flu vaccine and is able to change its reproductory system to produce new vaccine-resistant offsprings. It doesn't -- the flu virus tries to reproduce in the only way it knows to (using DNA replication mechanism of the host to "replicate" itself into hundreds of different copies). During that process, minor errors in the DNA copying mechanism, rare and completely random, creates imperfect copies of the parent's DNA. These new slightly changed DNAs give rise to "new strains" of the flu virus. This part, "mutation", is the only random part of evolution.
After this, the virus's "nature" (the environment in which it thrives, i.e. the human body) kicks in with "natural selection". Viruses acquire "mutations" spontaneously or randomly. But all mutations are not favorable for survival, and hence those viruses that aquire unfavourable mutations are lost. Only the virues that aquire favourable mutations are the "fittest" to survive (Darwin's "survival of the fittest"). Since generation time of viruses (hundreds can be produced simultaneously) are small and the populations large, they can fill up the lost pool in double quick time. Thus, natural selection is not random. The only "new strains" that *might* survive this natural selection are those that neither the body's inbuilt defenses, nor the vaccine, could eliminate.
The two very important things to understand here are:
Mutations are random, aimless, without any purpose, and without any control.
Natural selection is completely non-random. It is the result of systematic application of non-random natural laws to filter out the incompatible mutations.