Ever since Charles Darwin published On the Origin of Species in 1859, scientists have amassed vast amounts of evidence from a wide variety of disciplines, published thousands of peer reviewed papers, and made predictions that have been confirmed experimentally to make the theory of evolution by natural selection the foundational cornerstone of modern biology. Add to this the fact that no disconfirming evidence has ever been found (such as the proverbial fossil rabbit in Precambrian rock layers) and its universal acceptance among scientific experts and one can conclude with assurance that evolution is true.
To those who are even moderately versed in the tenets of evolutionary theory, that anyone could deny its validity seems astounding to a degree that is almost beyond belief. Yet, not only is it possible for some people to hold this view, it is shockingly prevalent in the US. According to a 2007 Gallup poll, about 43% of Americans believe that "God created human beings pretty much in their present form at one time within the last 10,000 years or so." While it may be tempting to claim that these individuals are at best deeply deluded, their denial can, in fact, be rationalized within the insular bubble of their worldview.
It should come as no surprise that all objection to evolution is religious in nature. The reason this is the case is that evolution is deeply threatening to their worldview (and for good reason). If humans evolved from single cell organisms over the course of millions of years, then our existence is solely a result of natural processes and random chance. This means that we were not made in the image of a creator, but are merely another kind of animal, and as such lack a soul. One can see how very quickly evolution undermines the entire edifice upon which religion is built. As such, the religious are faced with two options:
1. They must find a way to embrace both evolution and their faith, despite the conflict this engenders.
2. They deny the factual basis of natural selection because it is incompatible with their worldview (from which springs creationism and it’s duplicitous offspring, intelligent design).
It’s therefore important to point out that those who deny evolution are not necessarily stupid. They are simply using motivated reasoning defensively as a means to preserve their worldview and personal identity. One can almost feel sympathy for religious fundamentalists who must feel besieged on all sides by the exponential advances of science and the growing secularization of the outside world. Almost, if it weren’t for their attempts to suppress science, indoctrinate children and forcibly impose their wrong-headed ideas on others.
Among the Creationists : Dispatches from the Anti-Evolution Front Line is an anthropological study of creationists and their ideas as mathematician Jason Rosenhouse seeks to understand their convictions and motivations. While Rosenhouse’s treatment is sympathetic and respectful, he does not refrain from asking hard questions or from firmly stating the scientific evidence. What he finds is that creationists live in an insular world and are largely exposed only to information that conforms with their predetermined beliefs. In the rare instance that their views are challenged, they tend to react defensively and are resistant to reevaluating their position in light of new evidence. They are contemptuous of the scientific consensus and established experts, yet unquestioningly defer to their own so-called creationist authorities. Moreover, they realize that the best hope for propagating their views is through childhood indoctrination. Thus their vigorous and relentless (though, to date, largely unsuccessful) efforts to change public school science standards to include creationism.
All of this is, of course, depressingly familiar and poses significant challenges for the US educational system and America’s future as a technology leader. Unfortunately, given its centrality to personal identity, it will be difficult or impossible to change someone’s mind once they’ve bought in to creationist rhetoric. As the adage goes … you can’t reason someone out of a position they didn’t reason themselves into in the first place. With that said, the problem may very well resolve itself with time. Given that the global trend skews increasingly towards secularization, it is likely that evolution will attain expanding acceptance simply as a matter of course.