Actually, if the ultimate goal is survival there would be no 'junk'. Everything would play a part in helping a species to survive. The fact that you can see examples of things that do not contribute to survival, like mans need for explanations, does not contribute to the evolutionary theory where things must evolve traits that contribute to survival in order to survive.
There is no "ultimate goal" in unguided natural selection, and coming to realize that is important if you are to understand what the theory actually tells us. Naturally selected "designs" are in no sense intentional. That means that inheritable features which have little or no impact on survival will tend to linger across generations. For example, the fossil record and DNA comparisons tell us that hippos and whales had a common ancestor. We see traces of legs in modern whales, but the fossil record shows legged whales. Flightless birds still have wings, even though they don't use them for anything much. Humans still have tail bones. These are unnecessary, inefficient structures that an intelligent designer would have no reason to include in the design of modern whales, flightless birds, and humans.
So here is the point. We can tell the difference between intelligently guided and unguided "designs". Automobiles started out as "horseless carriages", but the intelligent designers removed the buggy whip holder, because they knew it wasn't needed. Whales are not like automobiles, and the vestigial remnants of legs are like buggy whip holders that were never left out of the design. There was no intelligence to remove the inefficiencies and useless "junk" that built up in the design over time.
And you have missed the difference between not having a purpose and simply not knowing what that purpose is.
Unguided selection has no "purpose". You can, of course, mistakenly attribute purpose to any natural phenomenon. For example, you might think that hurricane Katrina was sent to wipe out New Orleans because of all the sinful behavior of the inhabitants.
...Each variety resulting from reproductive isolation has a smaller gene pool than the original and a restricted ability to explore new environments with new trait combinations or to meet changes in its own environment. The long-term result? Extinction would be much more likely than evolution.
The question of whether an isolated population is large enough to sustain itself is a separate issue. Those that are not will collapse. Those that are will remain viable. We are only talking about cases where viable populations become isolated. Extinctions happen all the time. Evolution is not an efficient design process. It is not just about why certain biological designs succeed. It is also about why the competing designs fail. (BTW, TalkOrigins provides a list of
29+ Evidences for Macroevolution, in case you are interested.)
I would read Evolution: A Theory in Crisis, if I were you...
Thanks. I've given you reading assignments as well, so you are entitled to your recommendations.

Denton's book, a classic precursor to Intelligent Design, is now quite old (1985), and it appears that evolution has weathered the crisis that he warned about.

After the Dover court case, all the hype and stuffing seemed to go out of the ID movement. Right now, it seems in full disarray. Maybe Mike Huckabee will get lucky and give it another political boost from the White House.
The fact that science must use empircal evidence means that natural selection is always possible to falsify. You yourself admit it is never final, comprehensive and absolute. ID on the other hand gives us reason and logic, plus is supported by the evidence. To say ID isn't scientific involves two false assumptions: First, it presumes there is a clear line of demarcation between science and non-science (with creation on the non-science side of that line). Second, it presumes that disciplines outside of science have no place intruding upon scientific conclusions. That would pit fact against faith.
You don't seem to realize that ID once was the prevailing scientific theory--back in the 19th century. It was Paley's so-called "natural theology" that became received scientific theory. Darwin used scientific arguments to overturn it. The reason that it is called unscientific today is that it lingers on
in spite of the scientific consensus that it didn't measure up to the expectations that it had created. Attempted defenses of the modern version of Paley's old "natural theology" have been thoroughly debunked in every case, and that is why ID proponents have never really managed to get their work published in peer-reviewed scientific journals, as it surely would have been back in the 19th century.
However, the exclusion of ID from the realm of science is arbitrary for two reasons. First, the fact is there is no clear line of demarcation between science and non-science. Second, even if there were such a line, it wouldn't automatically mean that well justified conclusions from other disciplines could not have a bearing on scientific thinking.
Again, ID was tried and found wanting a century and a half ago. Attempts to revive it have not overcome the objections to it that modern scientists have.
For someone who grants that one doesn't have to give up supernaturalisim, you seem to be advocating that it's an inferior explanation so we should give it up. Problem with your whole issue is that you seem to think God has to explain everything or evolution has to explain everything. I would hold that there's room for both. Evolution can explain why mosquitos can evolve to resist DDT, but it can't explain morals, or happiness, or pleasure, etc. The question is where does the evidence lead? Given all the evidence evolution simply falls short on many issues.
The problem with your approach is that one could equally well attribute the "evolution" of resistance to DDT in mosquitos to divine (or devilish) intervention. Science doesn't prove material causation. It assumes it. When a reasonable material cause is found, science works the material explanation to death in the hopes of coming up with a better one. Religion just provides untestable answers. The reason why science has historically trumped religion is that it has consistently made progress in correcting erroneous explanations, as it did in the 19th century with Darwin's crushing attack on the scientific validity of natural theology. And one other thing: science actually delivers on its "miracles". It is possible that your religious doctrine is correct about the nature of reality, but the historical record of religious doctrines in actually being correct is appalling.
Hmmm, that fact that we have to go looking for evidence seems to indicate we currently have little to none. And saying "It MUST have happened elsewhere." falls under the same thing as "It MUST have happened." You're basing faith that results will turn up due to your philosophy of naturalism. It's possible those expectations can fail. And you still face the problem that the creation of the universe is not a repeatable and testable event. Or the extinction of the Dinosaurs.
Does it disturb you that scientists cannot
yet prove abiogenesis? Do you think that it makes your untestable religious claim
more viable? That's the whole point of science, you know. It doesn't always start out with a claim of infallible truth. It is a method for discovering truth. Religion offers only declarations of truth, and no method for discovering it. You are correct that the expectations of a material explanation might all fail. And I would still face the problem that the creation of the universe seems not to be solvable by scientific means. That would nevertheless not get you even an inch closer to the claim that goddidit. You are arguing a false dichotomy if you think it would. Ignorance of the answer does not entitle us to claim knowledge of it. Scientific methodology may fail, and its assumption of materialism be wrong, but it does have a record of fulfilling expectations. Religion has a bad record in that department.
Those kind of questions seem to boil down to "If we are complex and thus created, God, who is even more complex, must be created." There are only two catagories of things that can exsist: created and non-created. We know the universe is created because it's running down...
Here you equivocate on the word "universe" as all of existence and "universe" as just the observable universe that we can detect. When we observe the beginning of this "universe", we do not conclude that nothing physical existed before it or that something spiritual must have created matter. We have nothing to license such beliefs. Your argument fails, because it depends crucially on this equivocation of the term "universe".
One would expect something that had no beginning to not be constrained to time as we measure it. We would then expect that non-created thing to never change because, being outside time, it is the same at its beginning, its middle, and its end. A non-created thing must necessarily be eternal. Created things must come from something. "Out of nothing, nothing comes." So, if the created thing must come from something else, then it must come from something that exists prior to it. If we look at all the created things as a whole, they must come from a non-created thing. That is the only logical option open to us!
You arbitrarily exclude many other possible scenarios in which different physical universes, or even a "metauniverse", exist outside of our temporal framework. Because you equivocate on the word "universe", you talk yourself into a completely gratuitous assumption about what is "contingent" and what is "necessary". Worse yet, when you describe your god, you can't help but describe him as a being that exists in a temporal framework, complete with changes of state, causal events, and other properties that only make sense in our type of universe. Don't forget that we are supposed to have been "made in his image", and he took "seven days" (whether metaphorical days or not) to accomplish our creation. Surely even you must see that you aren't making a substantive claim here. If there are such similarities between us and an uncreated being, then what exempts him from the need to be created? This is where the divine "watchmaker" argument collapses under its own weight. We can ground our design in some original model, but whence the design of the model?
We know the universe is a created thing. We know that it must come from something else. We know that some type of non-created thing must exist in order to have created things exist...
But we don't know the nature of the "uncreated thing". It could just be a metauniverse that doesn't have a conscious mind. We can explain our own consciousness in terms of unguided evolution. Bodies need brains to keep out of danger long enough to create copies of themselves. The greater our self-awareness, the more accurately we are able to navigate away from suffering and towards happiness. Why would physical reality itself need to plan its actions? It is not in any danger and it has no drive to replicate itself. It has no need to avoid suffering or seek happiness.
...Explanation leads to actions that preserve and strengthen survival. Our ability to explain how things work gives us an edge in figuring out how to avoid, decrease and eliminate future dangers.
Yet many things have survived without this. Bacteria, plants, mosquitos, sharks, etc. Your problem is that explanation doesn't lead to survival it leads to knowledge and understanding. Immaterial things that aren't necessary to survival.
You still don't get it. Bacteria, plants, mosquitos, sharks, etc., inhabit different environmental niches than we do. They compete more directly with other organisms in those niches, and evolution guides their "design" to respond to different environmental challenges than ours does. Both you and sntjohnny have an extremely superficial concept of how evolution works. It doesn't tell us that life will produce only one type of organism--one size fits all. It tells us that life will produce an overabundance of environmental designs, and those that produce more offspring than competing designs will win a foothold in a given niche. It is about more than survival, because organisms become extinct all the time. It is about adaptation.
And guess what those methodologies have proven: you can't make heads or tails out of what they're seeing unless the person they're studing tells them what he/she is feeling. Perhaps if you gave it some thought instead of automatic dismissals you'd learn something. How do you know that this particular neurological activity--strawberries touching the tongue, creating a chemical response through the body--how does anyone know what that activity feels good? You can't know that by looking at your machine. Someone's got to tell you how it feels. That's how. You need the report so that you can correlate specific brain activity with the feeling of pleasure or the feeling of pain.
Gosh, that must mean that scientists need to come up with very clever experiments to verify their hypotheses, doesn't it? So they don't limit their experiments to one individual and one bowl of strawberries. They look at a statistically valid random sample. They publish their results for comparison against other studies. They look for corroboration from other types of experiments. You are right. They can't know. They can only speculate, conjecture, and....verify. If the expectations created by hypotheses and theories keep getting met, then their confidence in those hypotheses and theories grows. And the method seems to work very nicely--much better than trying to receive answers through revelation from a deity.
Indeed, for science to work at all, we need a soul on the inside to tell us what the outside feels like, looks like, smells like, tastes like and sounds like. Though science might probe the sense of smell and the sense of sight, science cannot tell us anything, not one single thing about the sensation of smell and the sensation of sight. Somebody's got to report that...
Again, you mention the undefined term "soul". My experience has been that Christians are completely inconsistent in their description of what that word means. Scientists look at many indications of mental activity, not just verbal reports. You can just show someone a picture and use MRI technology to see what happens when the same picture is shown to many different people. Such a method requires no subjective response from the subject. I am beginning to suspect that you have never looked at a published report or read accounts of these studies. You really don't seem to realize that scientists are as capable as you are of figuring out the weaknesses in their methodology. Actually, they're more capable than you, because their work is reviewed and critiqued constantly by people even more clever than you, hard as that may be for you to imagine.

You didn't even define the concept of "soul", so you neglected to take the very first step in proving its existence.
Sorry I try to argue in a way that assumes people have at least a High School education. Would you like for me to stop?
Oh, gosh, don't be so impatient with my ignorance. Tell me what you think the word "soul" means. Have mercy on the stupid guy with a Ph.D. in linguistics who has taught graduate seminars in semantics at an Ivy League university.

...Neurologists have drawn the mistaken conclusion that since certain states are correlated, certain brain states are correlated with your soulish functions--memory, thinking, choices, feelings-- and that means there is no self, there is no soul, there is just a brain state. That is a big mistake.
No neurologist has drawn such conclusions. I believe that there is a mind and a brain that sustains that mind. It is easy to observe that physical effects on the brain--trauma, drugs, lack of sleep--changes mental states. It is a completely unwarranted assumption that such mental states continue to change when the brain dies.
I am going to count on the fact that you have a self-conscious awareness of your own consciousness (I think therefore I am) as something different from your physical body. That is just the most common sense approach to reality with regards to human beings. We just seem to know that to be the case. It's rather self-evident.
Another thing that is self-evident is that physical changes to the brain can shut down self-awareness. For example, try chugging bottles of vodka--let's say ten. I predict that you and those observing you will come to a startling realization about the brain-mind connection. When you saturate your bloodstream with alcohol, it can cause you to lose consciousness, and even your life. Isn't it funny how consciousness always seems to be impaired by serious trauma to the brain? Do you think that there might be a connection between the physical brain and consciousness? I do.
Evolution can't even get started shaping biologiocal diversity without that biological life coming from non-life. For evolution to be a fact, you must have two things, minimally. First, you've got to have life coming from non-life--abiogenesis...
This is just utterly false. You aren't even close on this one. A god could set life in motion and just let evolution do the rest. Alternatively, life might evolve from inanimate self-replicating processes in nature (i.e. abiogenesis).
...Second, you've got to have a change in that life from simple forms to complex forms over time. You must have the kick-off, and you must have the rest of the game.
This is false, too. Evolution can, and has, led to simpler life forms. We can 'devolve' as well as 'evolve'. It all depends on what the environment selects for.
For evolution to take place, you don't even need life forms. All you need is a self-replicating process in which the copy-producing process has some flaw or perturbation that produces slightly different copies from the original matrix. Then you need a closed environment--a niche of some sort--that competing processes populate with copies of themselves. Among the competing processes in the niche, the ones that are better at self-replication will overwhelm the ones that are poorer. You can verify the process algorithmically in a computer simulation. Dawkins does it in
The Blind Watchmaker, and you can even run his program for it on the web.
The fact that no one knows how abiogenisis happens, apart from ID, and the fact that the simpilist forms of life are irreducibly complex throw a wrench in macro-evolution.
Scientists have lots of very interesting suggestions for how abiogenesis might have occurred, but none are yet confirmed. That does not mean that science is incapable of confirming abiogenesis in principle. As for irreducible complexity, it has been debunked over and over again. An excellent summary of the refutations can be found at
http://talkorigins.org/faqs/behe.html.