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Naturalism Implies Skepticism
A naturalistic worldview is one which accepts only the existence of matter and energy. Upon first blush, naturalism appears to be a pragmatic, well ordered, and easy to defend worldview. After all, if you can’t see it, why believe it? However, when one delves a little deeper, one will discover the great difficulty and confusion which maintaining this position entails.
One problem a naturalist encounters is this: On what basis is his reason considered reliable? How does a naturalist answer this question? From the naturalistic worldview, the human brain is simply a complex arrangement of matter and energy interacting to produce the illusion of consciousness. What is it about this arrangement that allows it to make truth claims? There is nothing! Working from the assumption that matter and energy are all that exist, a human being has not the slightest reason to trust his faculties of logic!
As human beings have witnessed, animals are prone to mistakes. Within the naturalistic system, human beings are seen as no more than animals. Consider the example of the Sphex Wasp. These wasp's are famous for the way in which they provide for their young. They burrow into the ground, find a caterpillar or some other type of bug, paralyze it with their stingers, fly it back to the burrow, leave the caterpillar right next to the burrow, go in and check for uninvited guests, then come back out and grab the caterpillar. The wasp then lays her eggs inside the caterpillar and leaves. When the eggs hatch, the wasp young will feed on the caterpillar. All of this goes off without a hitch, however, if someone or something moves the caterpillar just a short distance from the burrow, the wasp will move it back to the opening of the burrow, then go inside a second time to check it out again. At first this seems like an intelligent move, however, if the caterpillar is moved a third time, the wasp will repeat the same process again! It is possible to trap the wasp in an infinite loop of moving the caterpillar, checking the burrow, moving the caterpillar checking the burrow. As long as the caterpillar is moved a short distance from the opening every time, the wasp will repeat the last step.1
If animals can unknowingly make such mistakes, why not humans? Imagine a future evolution of the human race, one with more developed brains. Perhaps they would be able to find flaws in our most basic logic, in the same manner in which we find flaws in the wasp’s judgment. This implies that there is no basis, within the naturalistic worldview, to lend any credence to the theories and propositions of human beings. Naturalism provides no support for the validity of human reasoning and thus no support for its own validity. Therefore naturalism is self refuting.