The blue team shouldn't back off on its insistence that children be taught accurate biology in biology class, but we should acknowledge that the larger argument isn't really about biology, and cut the folks on the other side some slack rather than dismissing them as ignorant rustics.
This "larger argument", he suggests, is instead about morality, and whether evolution undermines it. I'm not sure why he thinks that this makes creationists any less ignorant. Well-meaning, perhaps, but rational and well-informed? I think not.
Majikthise already has an excellent response up (P.Z.'s is interesting too), so I'd just like to add a couple of quick points.
Here is the pro-creationist side of Kleiman's argument:
The Book of Genesis says that human beings, male and female, were created by God in God's own image. That's not just a proposition in paleontology; it encompasses two important moral claims.
First, it implies that each human being is a Divine project, and therefore has obligations to act in certain ways that flow merely from being a human being. Behaving foolishly or cruelly isn't, on this view, merely self-destructive or destructive, it's blasphemous, because those bad actions are being performed by an Image of God.
Second, Genesis implies that each human being I confront is sacred, again merely as a human being and without any reference to his behavior, status, or appearance. He (or she) is sacred as the Image of God. (C.S. Lewis says in one of his essays that, aside from the consecrated wine and wafer, any individual human being that you meet is the most sacred object you will encounter that day, more sacred than any relic or image.)
Firstly, I don't see how evolution poses any threat to the religio-ethical claim that humans reflect "the image of God". Kleiman later emphasises that the claim should be understood metaphorically. As I've argued before, the similar claim that "all men are created equal" is in no respect an empirical/descriptive claim at all. Rather, it is a normative claim to the effect that we ought to consider the interests of everybody - "all count in the moral calculus". Similarly, the claim that all humans are made in "the image of God" is not an empirical claim. So it is not threatened by the scientific account of our evolutionary origins. Presumably the claim instead reflects the nature of our rational agency, that humans - like God, and unlike the other animals - are capable of rational reflection, love, and so forth. Again, evolution says nothing about any of this, and creationists are foolish to believe otherwise.
Second, as I've previously argued, the purpose of a free agent's life cannot be externally imposed by any outside authority - not even God. The fact that we're part of a "Divine project", or have a purpose to God, does not entail that we have an objective purpose we're obliged to fulfill. Follow the link for the full argument.
Third, I think it is ethically dubious to promote concern for blasphemy over human welfare. If I hurt another person, this is wrong precisely because I hurt another person, not merely because the action constitutes blasphemy against God. Humans are not merely "sacred relics". We are people, not objects, and I think it an ethically repugnant consequence of the view Kleiman expounds that it fails to uphold this distinction. The more morally upright position is that persons have moral value in themselves, and not merely because it was bestowed upon them by some external source (i.e. God).
Any suggestion to the contrary, as I have argued before, is morally bankrupt:
I'd be fairly surprised if anyone was genuinely willing to embrace the consequences of this view. For suppose God were to tomorrow trumpet from the skies: "Behold, ye little mortals, the Jews have fulfilled the purposes I had for them. I value them no longer." Would that suddenly make it true that Jewish people are worthless? Would that make it morally permissible to hurt or kill them? Absurd!
The worth of a human being is not conditional upon their reflecting God's "image", or having his blessing. If God decided he didn't like Jews or gays, that would make them no less morally important. It's simply a mistake to tie God and morality together in such a way. The worth of a person derives from their humanity, not the blessing of divinity.
Next, consider the anti-evolution side to Kleiman's argument:
Insofar as middle-school Darwinism asserts that each of us is merely an animal of a particular species, fundamentally like animals of other species, it undercuts both halves of that double-barreled moral proposition. If I'm merely an animal, why shouldn't I act like one if I feel like it? And, if you're merely an animal, why shouldn't I beat you up, if I'm so inclined and bigger than you are?
Much here depends on what it means to say that we are "fundamentally like animals of other species". We are made of the same sort of physical materials, and developed via similar evolutionary processes from a shared common ancestor. But I don't see how any of that has moral relevance. Clearly the end result is something quite different. As I said above, we have evolved something that no other animal has: rational agency. This is something of the utmost moral importance. We, unlike other animals, can recognize and act on reasons.
So, why shouldn't you act like an animal? Presumably there are reasons against it. Perhaps in doing so you would harm yourself or others, or suffer the opportunity cost of failing to instead engage in other - more worthwhile - activities. Why shouldn't you beat me up? Because I'm a person and have intrinsic moral worth in virtue of my humanity, which you can recognize in virtue of your humanity, and thus we have the capability to co-exist harmoniously in a manner that serves all of our interests. (I grant that's a somewhat rushed and superficial response. See my essay "Why Be Moral?" for a more rigorous argument.)
At the end of the day, there simply isn't any good reason to support creationism. If you think it's good biology, then you're scientifically ignorant. If you think it's good ethics, then you're philosophically ignorant. Like Lindsay says, "Real respect requires us to call each other out on wishful thinking and bad reasoning. The members of the red team who cling to the literal story of Genesis are embracing a terrible theory for indefensible reasons." We do them no favours by pretending otherwise.