Two brief insights into the nature of belief, and the unreliability of surveys that ask about people's faith. First, Stephen Pinker:
When people are asked a question, they don't just turn a flashlight into their data bank of beliefs and read out what they see. When people say, "Yes, I believe in God and the Bible," they're kind of saying, "I'm a moral person. I have solidarity with the community of churchgoers that I was brought up in and that I currently belong to."
The truth is that, like Graham Greene, my faith is sometimes that my faith will return. It's something I struggle with a lot. On any given moment if you asked me [if] I believe in life after death, I think if you polled me regularly through the week, I think I would come down on the side of yes — that I do believe in life after death. [But] it's something that I wrestle with a lot.