A typical argument against religious belief goes like this: at some point in the past, human knowledge hadn’t advanced far enough to account for most of what we see in the world. For this reason, supernatural explanations proliferated. As science advanced, the gaps in our knowledge narrowed, forcing many of these supernatural beliefs into obsolescence. Naturalists acknowledge this trend and are justified in believing that we’ll continue to find natural explanations, and that the gaps will narrow even further. On the other hand, naturalists accuse believers of failing to acknowledge the trend and clinging to an embattled “god of the gaps” theory. This is how the argument typically goes, and here follow some of my thoughts on the matter.
Both gaps and supernatural explanations abound, of course, even to to this day. For example, physicists can talk about the state of the universe between now and a few fractions of a second after the big bang, but they can’t speculate about the state of the universe before then. Theists interject that this is the time during which god created everything. This is fine, since that explanation is just as valid as any explanation offered by science. Even so, we need to acknowledge two things:
First, it’s a mystery what happened during that time, and the explanations aren’t so much equally valid as they are equally unverifiable. That is, any explanation is conjecture. We simply don’t know.
Second, we might someday discover a natural theory to fill this gap. To be sure, we’re not certain a theory will be found, we’re merely justified in allowing for the possibility. Sometimes people fail to grasp this distinction. Physicists, for example, might discover a grand unification theory between quantum physics and relativity. The theory might subsequently reveal what happened during those first few moments, and even why the big bang happened in the first place. Such a theory may of course never be discovered, but then again maybe it will. In the meantime, physicists ought to allow for the possibility and pursue the question.
I don’t think these things disprove religious claims so much as they undermine the traditional epistemic basis for religious claims. Rather than becoming unbelievers when a certain theological notion is displaced by science, believers simply refactor the epistemic basis of their belief.* Or, if refactoring is too painful, they may attempt to wedge open the gap. This is reminiscent of Han, Luke and Leia, who, faced with the prospect of being squeezed out of existence, wedged a metal pole between the narrowing walls of the Death Star’s trash compactor. We all know what happened to that pole.
We can see this refactoring/resistence being played out by looking at the mystery of biological origins. This gap has narrowed considerably in recent history, but up until a hundred and fifty years ago it was wide open. The traditional (read: literal) doctrine of creationism filled the gap nicely, but when Darwin entered the scene, the gap started to squeeze shut. Accordingly, some have tried to combat evolution by wedging the poles of creation science and intelligent design between the walls. Others have abandoned the old doctrine and built new doctrines in less threatening places.
Let me reiterate that I don’t think shrinking gaps disprove theistic belief, as some assert. I think that, at most, they force theists to refactor their beliefs. At the same time, I think shrinking gaps justify methodological naturalism, which exists in a high degree of tension with theistic belief. I define methodological naturalism as distinct from metaphysical naturalism, or just naturalism as it is commonly thought of. In other words, where metaphysical naturalism professes certainty that natural explanations exist for everything, methodological naturalism merely allows for the possibility of natural explanations, as a matter of sound practice. As such, it’s one of the founding principles of modern science.
Strictly speaking, methodological naturalism is compatible with theism, but doctrines that concern “the gaps” are held with some degree of skepticism, simply because such doctrines have a habit of being displaced by science. The origins of human fallibility and morality fall into this category. Disciplinary fields such as evolutionary psychology, cognitive science and neurology hint at what may, in the future, become scientific theories about why we’re moral, or why we should be moral, or why we make mistakes and do bad things, or what “goodness” and “badness” are in the first place. Other gaps include the question of first cause and the mind/brain relationship. These areas are often considered the turf of doctrine, and it is these kinds of situations where doctrine risks running afoul of methodological naturalism and science in general.
* The term “refactor” is a programming term that means rethinking and recoding portions of a program’s code, without changing its overall purpose. The term, as it relates to life in general, means to rethink one’s approach, but not one’s overall goals, and includes a sense both tearing down and rebuilding.