Mere ChristianityA few months ago, I read my first Christian Apologetics book, Orthodoxy by G.K. Chesterton and hated it. When I discussed it with my friend Scott, he lent me Mere Christianity by C.S. Lewis. I must admit, this Christian Apologetics book was much better, even insightful. It was logically written, with clear definitions and little appeal to emotion. Lewis’s approach to defending his religion is the polar opposite of Chesterton’s. It was a joy to read. Well at least the first half for reasons I will discuss later.

This short book is so dense with interesting thoughts and claims that I plan on limiting my discussion to what I consider the three most interesting topics. In the interest of brevity, I will also spread those topics over three separate posts. The three topics are the existence of God, The Case for Christ, and ethical insights. Here is the first:

Lewis starts the book by using a simplified version of the normative moral argument for the existence of god. That is, moral laws are ‘outside of’ ourselves. In other words, moral obligations are independent of one’s goals and universal.

1. It appears to human beings that moral normativity exists.
2. The best explanation of moral normativity is that it is grounded in God.
3. Therefore God exists.

The key word is in premise 1: “appears”. Morality only has the appearance of normativity but is in fact, not normative at all. Furthermore, this appearance has an explanation best grounded in nature. Consider the possibility that morality is an evolved, social instinct. This would then create instinctual moral obligations in almost all (not all, due to genetic variation and/or mental deficiencies) members of the species. i.e. our moral instincts would have the appearance of being universal. Secondly, such an instinct is social and acts on the group level. Thus the moral instinct would sometimes conflict with our one’s own goals. Thus the instinct would have all the appearance of normativity.

Lewis does address the possibility that morality is an instinct. Lewis claims that morality cannot be an instinct because it helps us choose between two competing instincts. He uses the example of hearing a man crying for help. We may feel two competing instincts, one to help the man, the other to not help out of self-preservation. Morality tells us which of these two instincts we ought to obey: help the man. Because morality helps us choose between two instincts, Lewis claims, it cannot itself be an instinct. Furthermore, he says, morality often sides with the weaker instinct.

Lewis’s rebuttal is a defense of premise 2. He’s basically arguing that the natural explanation of morality as instinct is not an adequate one. I see a few of problems this rebuttal. First, the ‘ought’ feeling we get could be part of the instinct to help. This feeling would simply make the ‘help’ instinct stronger. Thus morality wouldn’t compel us to choose the weaker instinct, it’s simply the part of the instinct that gives weight to the social instinct.

The second problem needs more elucidation. Lewis precludes the possibility of meta-instincts; in this case, social instincts. As highly social animals, it should come as no surprise that our social instincts (help the man) sometimes conflict with our animal instincts (self-preservation). The ‘ought’ feeling comes from the fact that the helping instinct is social. Not only do I feel the instinct to help the man, but everyone I know would feel the same. Thus I know I ought to help in order to win social status and avoid social scorn. No one, of course, actually thinks through these logical steps, it is simply felt. As members of a species that completely depends on social interactions for survival, it should come as no surprise that we’ve evolved instincts to help us maintain our social networks.

Finally, I contend that premise 2 is out-and-out false. Variations of this premise are constantly recycled by religionists. Consider Creationists, “the best explanation of the complexity of life is God” or the argument from love, “the best explanation of love is God”, or the argument from consciousness, “The best explanation for consciousness is God”. All of these take the same form:

1. [Insert something that I don't understand] exists.
2. The best explanation for [Insert something I don't understand] is God.
3. Therefore God exists.

These are just veiled versions of a logical fallacy called argumentum ad ignorantiam (the argument from ignorance). When we lack a natural explanation, it is fallacious to assume that there isn’t a natural explanation to be found. We simply may not have found it yet. Thus even if I’m entirely wrong in my natural explanation of morality (Indeed, I very well could be since evolutionary psychology is a new and scientifically controversial field), it gives absolutely no credence to any supernatural explanations, including God.

Notice that this very same logical mistake is made outside of religion. Simply replace the word “God” with ‘ghosts’, ‘aliens’, or the “Flying Spaghetti Monster” and you can see that the argument from ignorance can be used to conclude all sorts of ridiculous things.

In conclusion, Lewis fails to firmly establish the existence of God. But suppose for a moment that he had. Okay, a Moral Law Giver exists. This is far from concluding that God as described in the Bible exists. Lewis admits as much in Part I of Mere Christianity. Hence Part II of his book, which I will address in a future post.

UPDATE: More of Mere Christianity reviewed here and here.