Evolution and Why Labels Don’t Matter

Theists (especially Young Earth Creationists who deny the reality of evolution) love to make a big deal about the emergence of species, constantly asking for evidence of one species (or “kind”) turning into another, or asking how the “first” member of a species could have possibly shown up suddenly one day if it had no other member of its species to mate with, etc. Here’s the thing that these folks either do not understand or else choose to ignore, however:

We humans looooove labels. We just can’t help ourselves. We have this innate burning need to distinguish everything from everything else and give it all labels to make sure that everybody knows what we are talking about. We have chairs and we have beds. When somebody invents something that can be used as both a chair and a bed, we call it a futon rather than just admitting that “chair” and “bed” are arbitrary labels in the first place. We label eating utensils that have tines as “forks” and eating utensils that have bowl-like depressions as “spoons”. But then somebody comes up with a utensil that has tines and a bowl-like depression, and we have to come up with a new label “spork” (or “runcible spoon,” if you prefer) because we just can’t deal with something that contradicts our previously defined labels.

The same is true with biology. We have “cats” and we have “dogs” and we have “birds” and we somehow think that just because we have come up with these labels that nature somehow cares one whit about making sure that reality conforms with them. And, sure, it’s pretty obvious that cats and dogs and birds are pretty distinct from each other, but things get awfully muddy when you start labeling each individual species of cat, dog and bird. Not to mention ape. We have arbitrarily defined “species” as groups of animals that can interbreed with each other, but this is simply our way of labeling things and not a hard and fast natural law. That’s why there are things like “ring species” where one group of animals can interbreed with a similar group living in proximity to them, and that group can interbreed with another group that lives in proximity to them, etc., but you eventually get to a group that can interbreed with their closest neighbor but can not interbreed with the original group. We then feel compelled to label the last group a different species from the first group.

All of this is to say that, yes, evolution is true and occurring all the time and yes, this means that any labels we put on things with regard to species, genus, etc., are necessarily going to be imprecise and have gray areas and be subject to revision. Which is, of course, why it is so ironic when some people who deny evolution claim it’s impossible for one “kind” of animal to evolve into another “kind” over time, as if they themselves have some infallible way of labeling things.

Why the Word “Supernatural” Is Meaningless

[Periodically, a question comes up asking whether atheists reject the entire idea of “the supernatural” all together or whether it’s just God that we don’t believe in. I can’t speak for all atheists, but as far as I am concerned the entire idea of “supernatural” is a wholly empty and meaningless concept to begin with. Of course, every time this question is asked, I come up with a slightly different way to express my feelings, so this post just captures my various responses.]

The word “supernatural” is wholly meaningless because:

1. The natural world encompasses everything we can see, feel, hear, taste, measure or in any way detect.
   
2. In order for something to truly be “supernatural”, it would necessarily need to not be part of the natural world.
   
3. Anything that is not part of the natural world cannot be seen, felt, heard, tasted, measured or in any way detected.
   
4. Therefore, regardless of whether anything supernatural exists or not, it is meaningless to talk about it since there is no way to detect it or know anything about it. The moment it becomes detectable in any way, it ceases to become supernatural. 

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In my experience, “Supernatural” is just a term that people use to describe proposed things for which there is no proof or good evidence but which we nevertheless think might possibly exist in some sense. Or, perhaps, things that we really wish existed despite all evidence to the contrary. For example:

• We have no real proof or good evidence that God exists, but we really, really wish He did, so let’s say that God is “supernatural” to explain why we can’t detect any evidence of His existence rather than acknowledging He doesn’t actually exist.
  
• We have no real proof or good evidence that ghosts exists, but we really, really wish they did, so let’s say that ghosts are “supernatural” to explain why we can’t detect any evidence of their existence rather than acknowledging they don’t actually exist.
  
• We have no real proof or good evidence that psychic powers exists, but we really, really wish they did, so let’s say that psychic powers are “supernatural” to explain why we can’t detect any evidence of their existence rather than acknowledging they don’t actually exist.
  
• We have no real proof or good evidence that the human spirit or soul exists apart from human brains, but we really, really wish they did, so let’s say spirits and souls are “supernatural” to explain why we can’t detect any evidence of their existence rather than acknowledging they don’t actually exist.

Rinse and repeat.

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Atheists, as a rule, don’t claim to have beliefs or knowledge about ultimate or absolute truths. That’s usually the realm of theists, and atheists generally say they don’t believe those claims.

As a rationalist, however, I strongly believe that “supernatural” is just a term made up to justify a belief in something for which there is no supporting evidence. Sure, there are things in the world that people can’t currently explain. Perhaps there even things that we will never be able to explain (why does seeing a person yawn make us want to yawn as well?). But anything that we can observe or detect or that has any effect whatsoever on the natural world is, as far as I’m concerned, part of the natural world and therefore, by definition, not supernatural.

Or, to put it another way, the supernatural cannot exist because existence itself is a natural state:

1. Something can be said to exist if it is composed of matter or energy and occupies time and space.
   
2. Anything that is composed of matter or energy and occupies time and space is part of the natural world.
   
3. Anything “supernatural” would, by definition, not be part of the natural world and would therefore need to not be composed of matter or energy nor occupy time or space.
   
4. Therefore, anything supernatural cannot be said to actually exist. Q.E.D.

The Scientific Method vs Theism

As an atheist, I have come to appreciate the scientific method as the best – if not only – way to determine truth. The basic principles of the scientific method are (a) observing a phenomenon, (b) coming up with a hypothesis to explain that phenomenon, (c) performing experiments and/or gathering data to support that hypothesis and (d) refine the hypothesis to fit the experiments and data (or even reject the hypothesis entirely if the experiments and data disprove it). The key point is that the hypothesis needs to match the evidence and not the other way around.

When I was a theist, however, I was taught to start with an acceptance that God existed, the scriptures were true, etc., and then look for evidence to support that belief if necessary. This is superficially similar to the scientific method (and many theists claim that they in fact follow the scientific method), with one key distinction. Whenever data is discovered that fails to support (or even contradicts) the belief in God, the data needs to be tweaked (or sometimes outright ignored). If, for example, geological evidence clearly shows that the Grand Canyon was created via slow processes over millions of years and this data contradicts the notion that the earth is only 6,000 years old, it’s important to selectively ignore the evidence until you can explain the remaining evidence as having been produced by a global flood.

Proponents of “Creation Science” (a.k.a. Intelligent Design”) often point to, say, the perfection of the human eye as proof that it must have been the product of a divine, perfect creator. The eye, the argument goes, is just too complicated and works so well that it couldn’t possibly have happened just by chance. Ignoring for the moment the fact that this is really just an argument from ignorance (“the eye is just too complicated and works so well that I personally can’t understand how it could possibly have happened just by chance”), and also ignoring for the moment that the Theory of Evolution explicitly posits the concept of natural selection as the driving force behind the development of complex structures such as the eye instead of chance, this argument does have the superficial appearance of following the principles of the scientific method. The phenomenon of a complicated, perfectly functioning eye is observed, and the existence of a divine, perfect creator is offered as a theory to explain that phenomena.

Where things go off the rails, however, is when you point out that the eye is not, in fact, perfect. The human eye has a blind spot inherent in its design, which is perfectly explainable when you consider how the eye might have developed over millions of years but doesn’t make much sense for a perfect creator to have done it that way. In addition, human eyes are susceptible to all sorts of abnormalities and diseases, and many people have to resort to corrective lenses or surgery in order to see clearly. In fact, many people are actually born completely blind. Under the scientific method, evidence that contradicts a particular theory causes the theory to be refined or rejected. Under “Creation Science”, however, the response is typically that we live in a fallen state due to the sins of Adam and that is why the eye is currently not perfect (or why people get diseases or why animals feed off each other or why there is so much pain and suffering in all aspects of the natural world, etc.). And this is because, rather than truly following the scientific method to fit the theory to the facts, theists start with a set of assumed “truths” (i.e., that God exists, that He created the universe in a perfect state originally and that we now live in a fallen universe due to the sins of Adam) and then look for any observable facts that support those “truths” while rejecting any that don’t support them.

If perfection of design proves the existence of a perfect creator, imperfection of design can’t somehow also prove the existence of the same perfect creator.  Looking just at the observed phenomena, without any preconceived, unchallenged assumptions as to the existence and nature of God (which is, of course, the very thing that is supposed to be proved so it can't be assumed), imperfection of design is instead evidence of an imperfect creator, or perhaps a malevolent creator, or of no creator whatsoever.  The one thing it absolutely cannot be is evidence of a perfect creator, unless you already believe in the God of the Bible and are simply looking for a justification of that belief instead of actually trying to come up with a theory that best explains the evidence.

People are, of course, free to believe whatever they choose to believe, and the whole reason churches exist is to let people with similar beliefs congregate and share those beliefs with one another. And there’s nothing wrong with that (assuming, of course, those beliefs don’t lead the believers to harm other people as a result). But this essential difference between the scientific method and theism is one of the main reasons why “Creation Science” or “Intelligent Design” has no place whatsoever in a science classroom. Call it what you will, it just isn’t scientific as long as it exists to fit the facts to the theory instead of the other way around.