"Although atheism might have been logically tenable before Darwin, Darwin made it possible to be an intellectually fulfilled atheist"

-- Richard Dawkin, The Blind Watchmaker

Much of the point of evolution is that it is an answer to Paley’s Blind watchmaker argument. Biology is so full of different parts arranged in such a precise manner to make life work that it is a strong prima facie argument for design. Darwinian evolution is a theory that can explain the apparent design as the product of chance and time.

From my rejected script Cheerleading and Chess

Charisma: It’s logically impossible to rationally believe in Darwinism.

Hylas: Really? I could say the same thing about your beliefs.

Charisma: “I don’t know anything.” Counting with 9 fingers “I can’t make a sentence that’s slows down to calculate while talking nine words long.” “In fact, I can’t say a single word in English.” What do all those statements have in common?

Hylas: They’re all self-refuting. By saying or believe it, it can’t be true.

Charisma: Smiles. Good, Hylas. Beat. So, you’re a Darwinist.

Hylas: Slowly. Yes.

Charisma: You believe that you are the wonderful end product of mutation and natural selection.

Hylas: Slowly still. Yes.

Charisma: And in the whole process, there’s no design. It’s just blind nature and randomness that puts things together and selects what is fit to survive.

Hylas: Nodding That sounds about right.

Charisma: So, right now, the creature before me is the product of the unintentional laws of nature and chance.

Hylas. Yes. Are you going anywhere with this?

Charisma: Is it rational to believe something that’s been tested by logic and evidence?

Hylas: Of course, that’s the definition of rationality.

Charisma: Is it rational to believe in ideas and thoughts that come about randomly?

Hylas: Of course not.

Charisma. Then can you rationally believe that you yourself and all your thoughts are the end product of the unintentional laws of nature and chance?

Beat. Hylas looks like he’s about to say something, but the words don’t come out.

Hylas: It does seem self-refuting. There seems to be a trick, but I haven’t figured it out yet. Did you come up with that yourself?

Charisma: Nah, I got it from C.S. Lewis.

Hylas: The guy who wrote the Chronicles of Narnia? Children’s stories?