The role of belief in religion is greatly overstated, as anthropologists have long known. In 1912, Émile Durkheim, one of the founders of modern social science, argued that religion arose as a way for social groups to experience themselves as groups. He thought that when people experienced themselves in social groups they felt bigger than themselves, better, more alive — and that they identified that aliveness as something supernatural. Religious ideas arose to make sense of this experience of being part of something greater. Durkheim thought that belief was more like a flag than a philosophical position: You don’t go to church because you believe in God; rather, you believe in God because you go to church.

In fact, you can argue that religious belief as we now conceptualize it is an entirely modern phenomenon. As the comparative religion scholar Wilfred Cantwell Smith pointed out, when the King James Bible was printed in 1611, “to believe” meant something like “to hold dear.” Smith, who died in 2000, once wrote: “The affirmation ‘I believe in God’ used to mean: ‘Given the reality of God as a fact of the universe, I hereby pledge to Him my heart and soul. I committedly opt to live in loyalty to Him. I offer my life to be judged by Him, trusting His mercy.’ Today the statement may be taken by some as meaning: ‘Given the uncertainty as to whether there be a God or not, as a fact of modern life, I announce that my opinion is yes.’ ”

To be clear, I am not arguing that belief is not important to Christians. It is obviously important. But secular Americans often think that the most important thing to understand about religion is why people believe in God, because we think that belief precedes action and explains choice. That’s part of our folk model of the mind: that belief comes first.

And that was not really what I saw after my years spending time in evangelical churches. I saw that people went to church to experience joy and to learn how to have more of it. These days I find that it is more helpful to think about faith as the questions people choose to focus on, rather than the propositions observers think they must hold.