When God Talks Back: Understanding the American Evangelical Relationship with God, Luhrmann 2012; excerpts from the preface:

"It ought to be difficult to believe in God. God is invisible. You cannot shake God’s hand, look God in the eye, or hear what God says with your ears. God gives none of the ordinary signs of existence. The sacred books are full of impossible contradictions, apparently absurd beliefs—invisible fathers, talking snakes, a dead man who comes to life and flies up to heaven.
And yet of course people do believe in God. According to a Gallup poll, roughly 95 percent of Americans say that they believe in the existence of “God or a higher power,” a percentage that has remained steady since Gallup began polling on the eve of the Second World War. In 2008 the Pew Foundation conducted a quite extensive representative survey. In its sample, two-thirds of Americans completely or mostly agreed that angels and demons are active in the world today, and nearly one-fifth said that they receive a direct answer to a specific prayer request at least once a week.1 Many Americans not only believe in God in some general way but experience God directly and report repeated contact with the supernatural.

Evolutionary psychology looks only at part of the puzzle. It describes the way our intuitions evolved and explains why claims about invisible agents seem plausible, and why certain ideas about God are found more often in the world than others.3 But evolutionary psychology does not explain how God remains real for modern doubters. This takes faith, which is often the outcome of great intellectual struggle.

Let us begin by turning the skeptic’s question on its head. If you could believe in God, why wouldn’t you? There is good evidence that those who believe in a loving God have happier lives. Loneliness is bad for people in many different ways—it diminishes immune function, increases blood pressure, and depresses cognitive function—and we know that people who believe in God are less lonely. We know that God is experienced in the brain as a social relationship. (Put someone in the scanner and ask them about God, and the same region of the brain lights up as when you ask them about a friend.) We know that those who go to church live longer and in greater health.10

It didn’t have much to do with belief per se. Skeptics sometimes imagine that becoming a religious believer means acquiring a belief the way you acquire a new piece of furniture. You decide you need a table for the living room, so you purchase it and get it delivered and then you have to rearrange everything, but once it’s done, it’s done. I did not find that being or becoming a Christian was very much like that. The propositional commitment that there is a God—the belief itself—is of course important. In some ways it changes everything, and the furniture of the mind is indeed distinctively rearranged. But for the people I spent time with, learning to know God as real was a slow process, stumbling and gradual, like learning to speak a foreign language in an unfamiliar country, with new and different social cues.
In fact, what I saw was that coming to a committed belief in God was more like learning to do something than to think something. I would describe what I saw as a theory of attentional learning—that the way you learn to pay attention determines your experience of God. More precisely, I will argue that people learn specific ways of attending to their minds and their emotions to find evidence of God, and that both what they attend to and how they attend changes their experience of their minds, and that as a result, they begin to experience a real, external, interacting living presence.
In effect, people train the mind in such a way that they experience part of their mind as the presence of God. They learn to reinterpret the familiar experiences of their own minds and bodies as not being their own at all—but God’s. They learn to identify some thoughts as God’s voice, some images as God’s suggestions, some sensations as God’s touch or the response to his nearness. They construct God’s interactions out of these personal mental events, mapping the abstract concept “God” out of their mental awareness into a being they imagine and reimagine in ways shaped by the Bible and encouraged by their church community. They learn to shift the way they scan their worlds, always searching for a mark of God’s presence, chastening the unruly mind if it stubbornly insists that there is nothing there. Then they turn around and allow this sense of God—an external being they find internally in their minds—to discipline their thoughts and emotions. They allow the God they learn to experience in their minds to persuade them that an external God looks after them and loves them unconditionally.
To do this, they need to develop a new theory of mind. That phrase—theory of mind—has been used to describe the way a child learns to understand that other people have different beliefs and goals and intentions. The child learns that people have minds, and that not everything the child knows in his or her mind is known by other people. Christians must also learn new things about their minds. After all, to become a committed Christian one must learn to override three basic features of human psychology: that minds are private, that persons are visible, and that love is conditional and contingent upon right behavior. These psychological expectations are fundamental. To override them without going mad, people must develop a way of being in the world that is able to sustain the violations in relation to God—but not other humans. They do it by paying attention to their minds in new ways. They imagine their minds differently, and they give significance to thoughts and feelings in new ways.
These practices work. They change people. That is, they change mental experience, and those changes help people to experience God as more real. The practices don’t work for everyone, and they do not work for each person to the same extent, but there are real skills involved here, skills that develop a psychological capacity called absorption that perhaps evolved for unrelated reasons, but that helps the Christian to experience that which is not materially present. These skills and practices make what is absent to the senses present in the mind."
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