Obviously enough, we cannot decide what evolution entails without a fairly sharp conception of what it is. - John Dupré

One commonly held ideal of a possible good life is one spent in adoration of or service to the Supreme Being. It is hard to believe that the value of such a life is independent of whether there is, in fact, any such being to adore or serve. In sum, how we should live is a question that cannot be wholly separated from facts about how things are.

The limits of a creature’s consciousness are closely related to its particular set of capacities. As I shall elaborate in a moment, language provides us with an extraordinarily enhanced set of capacities, and consequently with an equally enhanced realm of consciousness. Perhaps this should be seen as a case in which a difference of degree amounts to a difference of kind. But if so, it is crucial to remember, from the point of view of evolution, that a difference in kind can be the summation of many small differences of degree.

The main point I want to make in this chapter is that prior to the development of a convincing theory of evolution there was an argument of sorts for belief in God, and an argument that could have been seen to meet naturalistic standards. However, this argument, always problematic, was entirely undermined by the development of a convincing account of evolution. Consequently, I claim, we have no good reason for belief in God. This is, of course, a very major contribution to our world-view.