"'Naturalism' is the belief that in the final analysis, nature is all that there is, and that 'nature' is essentially unmodified by anything other than itself. In other words, nature itself is thought to be the ultimate reality."
See what Bush does there? He characterises the naturalistic worldview as belief in a god of some kind. I've seen this tendency before* — it's as if the theistic mindset cannot conceive of a worldview that doesn't contain some ultimate thing, which even if it's not a god, is certainly god-like.
"Naturalism affirms no God except the god of impersonal, nonliving, undesigned physical chemistry."
Truth, however, is not something that exists in some transcendent realm, in and of itself. Truth is merely a description applied to facts and knowledge. Like reason and logic (and indeed morality), truth has no existence of its own.
Bush's argument against naturalism is basically that it's self-refuting, because in the naturalistic worldview, he says, nothing can be known as objectively true, and therefore that must include naturalism itself. Bush ends his piece in typical fire-and-brimstone fashion, quoting Genesis and decrying naturalistic nihilism.
But he's missed the boat. Naturalism doesn't have to be objectively true (in fact nothing does). It only needs to be true in practice. Notions of absolute truth, once discarded, leave open the possibility of determining what hypotheses about the natural world fit with what we already know, and testing them. This is how science progresses. So far, it seems to be working.
A version of this chapter is available online:
*The Alpha Male Monkey — Matt Arnold: