Why do some atheists think it's a bad idea to draw too close a relationship between naturalism and Darwinism? One possible reason is they fear that eventually some astute judge will realize that Darwinism is essentially of the same philosophical genre as intelligent design and will conclude that if ID is religious then so, too, must Darwinism be. This judicial epiphany will ultimately eventuate in the loss of Darwinism's position of privilege in publicly funded schools.
Casey Luskin makes this point in an interesting essay at Evolution News and Views.
The fact that Darwinism and ID are philosophical mirror images should be obvious to all but the most otiose of observers, but for some reason, it's not. Darwinism claims that physical processes and forces are capable of explaining all of the biological facts of nature. ID is simply the denial of this claim. Why, then, should the latter be ruled "religious" while the former is not? How can one claim be deemed to be science, while it's negation is deemed to be religious?
If the courts ever realize how simple this matter is they're going to find themselves in the awkward position of having to rule that either ID is science, even if it's false (Richard Dawkins' position), or that Darwinism is essentially religious, even if it's true. It'll be interesting to watch judges and lawyers trying to massage that porcupine.
RLC