“I'm a huge believer in evolution (not in the sense that "it happened" – anybody who doesn't believe that is either uninformed or crazy, but in the sense "the processes of evolution are really fundamental, and should probably be at least thought about in pretty much any context").”

[NewsBank, Lily Kuo, Bill Nye the Science Guy: - Creationism not good for kids, The Chronicle, Willimantic, Connecticut, August 28, 2012, Reuters]

Every birth in every lineage is a potential speciation event, but speciation almost never happens, not once in a million births. Mutation in DNA almost never happens — not once in a trillion copings — but evolution depends on it. Take the set of infrequent accidents — things that almost never happen — and sort them into the happy accidents, the neutral accidents, and the fatal accidents; amplify the effects of the happy accidents — which happens automatically when you have replication and competition — and you get evolution.
Breaking the Spell (2006)

Source: Darwin, God and the Meaning of Life: How Evolutionary Theory Undermines Everything You Think You Know (2010), p. 256

Source: The Causes of Evolution (1932), Ch. V What is Fitness?, pp. 158-159.
Context: I have given my reasons for thinking that we can probably explain evolution in terms of the capacity for variation of individual organisms, and the selection exercised on them by their environment....
The most obvious alternative to this view is to hold that evolution has throughout been guided by divine power. There are two objections to this hypothesis. Most lines of descent end in extinction, and commonly the end is reached by a number of different lines evolving in parallel. This does not suggest the work of an intelligent designer, still less of an all mighty one. But the moral objection is perhaps more serious. A very large number of originally free-living Crustacea, worms, and so on, have evolved into parasites. In doing so they have lost, to a greater or less extent, their legs, eyes, and brains, and have become in many cases the course of considerable and prolonged pain to other animals and to man. If we are going to take an ethical point of view at all (and we must do so when discussing theological questions), we are, I think, bound to place this loss of faculties coupled with increased infliction of suffering in the same class as moral breakdown in a human being, which can often be traced to genetical causes. To put the matter in a more concrete way, Blake expressed some doubt as to whether God had made the tiger. But the tiger is in many ways an admirable animal. We have now to ask whether God made the tapeworm. And it is questionable whether an affirmative answer fits in either with what we know about the process of evolution or what many of us believe about the moral perfection of God.

Unmasking the False Religion of Evolution (1996)

“All of us.”
Source: Our Lady of Darkness (1977), Chapter 30 (p. 181)

Responding to a question of whether he holds his views as a philosopher or as a biologist.
The Open Mind interview (1985)

Source: James Cameron's Titanic