Dawkins is clearly perplexed and angry that, 400 years since the dawn of the Enlightenment, so many people continue believe in God. So why aren't people satisfied with a purely scientific understanding of the world? Are they deluded? Dawkins certainly thinks so. But for Nagel, the explanation lies in the fact that the reductionist worldview offered by modern science simply doesn't do justice to reality as experienced by actual humans:
Dawkins, like many of his contemporaries, is hobbled by the assumption that the only alternative to religion is to insist that the ultimate explanation of everything must lie in particle physics, string theory, or whatever purely extensional laws govern the elements of which the material world is composed.
This reductionist dream is nourished by the extraordinary success of the physical sciences in our time, not least in their recent application to the understanding of life through molecular biology. It is natural to try to take any successful intellectual method as far as it will go. Yet the impulse to find an explanation of everything in physics has over the last fifty years gotten out of control. The concepts of physical science provide a very special, and partial, description of the world that experience reveals to us. It is the world with all subjective consciousness, sensory appearances, thought, value, purpose, and will left out. What remains is the mathematically describable order of things and events in space and time.
That conceptual purification launched the extraordinary development of physics and chemistry that has taken place since the seventeenth century. But reductive physicalism turns this description into an exclusive ontology. The reductionist project usually tries to reclaim some of the originally excluded aspects of the world, by analyzing them in physical--that is, behavioral or neurophysiological--terms; but it denies reality to what cannot be so reduced. I believe the project is doomed--that conscious experience, thought, value, and so forth are not illusions, even though they cannot be identified with physical facts.
Dawkins fails to realize that science will never be able to provide an adequate basis for a complete understanding of human existence. It can only give us abstractions which, however useful they may be, are not the substance of life. What Johann Hamann says of historical events is also true of scientific theories and the law of nature; they "are like that wide valley full of dry bones - and lo, they were very dry. No one but a prophet could presage that veins and flesh would grow on these bones and that skin would cover them. As yet there is no breath in them, until the prophet prophesies unto the wind and the word of the Lord speaks..."