For a while now I’ve been dissatisfied with William Lane Craig’s moral argument for the existence of God. Or more to the point, (seeing as I suspect that the argument is actually sound), I’m dissatisfied with how he normally defends the argument. I want to use this space to explain what I see as his method’s shortcomings. However, a caveat I give is that I’ll be critiquing Craig’s defence as I’ve come across it in his debates and online material. Craig is no fool and charity requires acknowledging the possibility that he does things differently in his scholarly published works, or that I’ve simply misunderstood the argument. At any rate, for what they’re worth, here are my thoughts on the matter.
The form of the argument he typically gives is this:
1. If God does not exist, objective moral values and duties do not exist.
2. Objective moral values and duties do exist.
3. Therefore, God exists.
The first premise is the one I want to concentrate on. As a material conditional, it is false if and only if the antecedent is true and the consequent is false. That is, the premise is false if God does not exist and moral values and duties do exist.
Presumably there are a number of atheists who think that is precisely how things are. They think that atheism is true and that this fact does not affect the existence of moral duties and values whatsoever. Not every atheist is a “subjectivist” about moral values and duties. So how does Craig aim to convince these atheists, or other folk who think this atheist position is not absurd?
From what I’ve seen, Craig defends the first premise by examining various naturalistic accounts of ethics (naturalistic as in non-supernatural, not naturalistic in the more technical sense used in metaethics) showing that they fail to account for, or “ground”, objective moral values and duties. Let’s assume for the sake of argument that Craig’s critiques of these accounts are on the money. We’ll ignore any problems we might have with his criticisms or any quibbles we might have with his understanding of “objective” etc. If we’ve successfully put such worries aside then, we’ll be willing to explore the thought that, as Craig claims, there are no plausible naturalistic accounts of how it is that objective moral values and duties can exist.
The question that springs to my mind at this moment is “so what?” Perhaps there is no successful naturalistic account of these important ethical features to hand. Are we to think that a plausible naturalistic account could never be formulated? What stops the atheist from saying, “that’s right I don’t have a plausible naturalistic metaethical account, but I know intuitively that there are objective moral values and duties. I don’t need to explain how something is so to know that it is so. Perhaps we will know how it all fits together in the future.” As far as I can tell an atheist would be perfectly within their rights to say that. Showing that there is no adequate naturalistic account of values and duties available is not the same as showing that objective values and duties can’t exist given naturalism.
As such it seems to me that Craig either needs to do more to defend the first premise, or argue for a weaker conclusion, such as “theism is the best explanation of objective moral values and duties.” To adequately defend the first premise he needs to, by my understanding, give an analysis of the necessary conditions for the existence of objective moral values and duties, and demonstrate that, necessarily, atheism cannot meet those conditions.