(Book: On Guard, by William Lane Craig. Chapter 5: “Why is the universe fine-tuned for life?”)
Dr. Craig closes Chapter 5 with an attempt to debunk The God Delusion by Richard Dawkins. Specifically, he goes after Dawkins’ famous “Ultimate Boeing 747″ argument, in an attempt to show that it does not disprove the “design” argument he makes for a “fine-tuned” universe. But before we dig in, I want to make just a quick observation about the difference between “design” and mere “function”.
In brief, the difference between design and function is simply the presence or absence of intention. Outwardly, design and function are indistinguishable: all you can see is that a certain set of causes work to produce a specific result. If this result was an intended outcome, then we say it was produced by design; if not, then it is merely functional. If a squirrel climbs a tree one one side of a stream, and runs across interwoven branches to reach a tree on the other side, then the branches function as a bridge. This does not mean, however, that the trees were designed as a bridge unless someone specifically intended for the trees to have that function.
Scientifically, all we can observe is the function. The evidence cited by ID creationists does not consist of actual, verifiable intention, it consists merely of specific instances of function. To turn this into design, we must assume the presence of actual intention which is not present in the evidence itself. In other words, what ID creationists are doing is making the assumption that observed functions were intended by some Creator, and then using this assumption to interpret the evidence in a way that leads to the conclusion that the functions were intended by some Creator. Or more briefly, they’re just being superstitious.
Now then, on to Craig v. Dawkins.