Phillip E. Johnson on Materialism and ReasonThe Wedge of Truth (Downers Grove, IL: InterVarsity Press, 2000), p. 149.
[T]he logic of materialist reductionism implies that science itself is the product of unreasoning material causes. No wonder the Age of Reason ends with the age of postmodernist relativism! And yet we still see the reductionists complacently describing religious belief either as a meme or as the product of a “God module” in the brain without realizing that they are sawing off the limb on which they themselves are sitting. If unthinking matter causes the thoughts the materialists don’t like, then what causes the thoughts they do like?