Next point: the evolutionary basis of religion. I will readily admit to having a strong bias on this one. I believe that evolutonary psychology is bunkum so far. It is speculation with little evidence, and proponents are (at best) stretching their conclusions way past what is justified. With that said, chapter five did little to convince me that it’s good science. To his credit, Dawkins does readily admit that his ideas in this chapter are only speculation.
He begins with a passage stating that only behaviors that help the survival and propagations of genes (or at least “replicators”) can survive, because nature is so ruthless. Evolution eliminates not only harmful traits, but also useless ones because they are wasteful. Right here he’s made a big leap, because he’s assumed that all behavior is genetic.
Obviously there is much ongoing debate about how much of human behavior is genetic, and it’s far too complex to even summarize in this thread. While I lean towards the less genetic end of the debate, I realize there are some good arguments on the other side. But in this chapter, Dawkins never acknowledges an opposing viewpoint. He never even mentions that any behavior might be partially environmental. Hence he gives a misleading picture of where the biological community stands.
Oddly Dawkins even admits that there are behaviors with no known survival value, but he insists that there must be survival value that we just can’t see. He might as well gaze wistfully towards the heavens and say, “evolution works in mysterious ways.” He’s being completely dogmatic at this point, saying that the theory can’t possibly be wrong or even fail to apply in a single case.
Next he’s on a whirlwind tour of possible evolutionary explanations for religion. He comes down against a few, and then presents his personal favorite: evolution decided that children should have genes which make them believe what their parents tell them, and religion survives as a side effect of these genes.
As I’ve already said, I don’t believe that genes have much effect on behavior, but I try not to be close-minded on the issue. As I see it, the convincing arguments for a genetic basis for behavior would be (in order of decreasing strength):
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Identify the exact gene that causes the behavior.
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Identify the physical structures in the body that cause the behavior.
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Conduct a large survey of several generations, showing that the behavior is inherited and cannot be explained by any other means.
In most cases that I follow, those arguing for behavioral genetics make only a small effort at 3, and none at 1 and 2. I find that the popular media tends to eagerly report findings that aren’t really justified. For instance, in 1993 a scientist named Dean Haber claimed to have found the gene that causes homosexuality in men. Other researchers disagreed with his results, but Haber’s conclusions have been widely reported and accepted by many. (See here for further discussion.)
There are possible explanations for how behavior genese could exist and thus far have eluded detection, but obviously that’s not as good as actual evidence. An analogy may be useful. Up to the late 1800’s, physicists all agreed on the existence of the “luminiferous ether” that carried light waves. Then a series of arguments proved that it would have to have contradictory properties. Various theories were offered, some quite creative, to explain these results. In the end, however, a better explanation won out: the ether didn’t exist. I think that behavior genes, at least in most cases, will eventually go through a similar story.