A passage about Charles Darwin’s religious beliefs from a Browser interview with evolutionary biologist Jerry Coyne:

“What about his own religious views? Was he an atheist?

When he was younger he was probably religious by default, in the way that most liberal people were religious in Britain back then. He was actually going to train to be a minister, but didn’t like it very much. As he became older, he started shedding all these appurtenances of belief. He would still use words like Creator. For example, he says in The Origin that the Creator breathed life into one or more original forms of life. People take that to mean that he was religious. But if you read his autobiography, or his letters to [Thomas] Huxley and others, it’s clear that he didn’t believe in any kind of personal God at all. He says, for example, that he could not believe that a God could exist who would design a cat that would torture mice, or a wasp whose larvae eat their prey from the inside. The horrors of nature convinced him that the world was a naturalistic, materialistic phenomenon.

I doubt there was any vestige of real religion left in Darwin by the time he was a middle-aged man. He didn’t go to church even though his wife, Emma, did. And he never made any expression of religious belief. Creationists are always trying to promulgate the myth that Darwin was religious, but there’s simply no evidence for it. Almost all of us who have read Darwin realise that. He may have called himself an agnostic – which is, by the way, a term invented by his friend Huxley – because atheist was a strong word back then. But I don’t think he believed in God, and I’m pretty sure he didn’t think he was going to go anywhere after he died.”