In response to the challenge to reply to Michael Gerlson’s argument against atheism, I offer the following:
It is hard to say what exactly Mr. Gerlson’s argument is since it is not expressed very clearly or precisely. Reading between the lines, I think the argument may be reconstructed as follows: The problem of deriving an “ought” from an “is” is insuperable for atheistic naturalism, but does not exist for theists. From a naturalistic perspective, our instincts and impulses are all on a par. Our capacities for selfishness and compassion are both simply facts about our psychology. Labeling one tendency “good” and the other “bad,” or saying that we “ought” to be compassionate and not selfish, is more than we have a right to claim if our worldview encompasses only physical factuality. For theists, on the other hand, “ought” is woven into the very fabric of reality since God, the ultimate reality, is essentially good. Theists therefore do not have the problem of deriving or justifying their “ought.” For them, the source of “ought” is the eternal nature of God.
One might respond by taking the fight to the theists. There are, of course, the ancient Euthyphro-dilemma problems: What do we mean when we say that God is good? If goodness is defined in terms of God’s nature, then it is an empty tautology to say that God is good. It amounts to saying that God’s nature is God’s nature. It does no good to say, as theists do, that all goodness flows from God, or that he is the source of all good things. Even if this were so, it would be beside the point. The question is not where good things come from but the nature of goodness. What is the quality that defines goodness? Whatever answer is given, if, indeed, goodness is even definable in some non-vacuous way, theists, like everybody else, will have to define it in terms that make no essential reference to God’s nature, or they turn their hymns of praise into empty bombast.
How should naturalists deal with the is/ought problem? There are two main options: subjectivism and naturalism. Subjectivists concede that facts cannot imply values and they hold that values are our invention; they express how we, individually or collectively, feel about things. The other alternative is naturalism. Naturalists hold that value is a natural property, one that supervenes on other natural properties. Thus, for Aristotle, the prototypical ethical naturalist, happiness, eudaimonia, is a natural state of flourishing or well-being for human creatures. Its value is not determined by our choices or feelings but by the facts of human biology and psychology. Thus, for ethical naturalists, there just is no fact/value dichotomy. Now theists might not like these answers, but not liking someone’s answers is very different from saying, as Mr. Gerlson does, that atheists have no answers to the question of where norms and values come from.