What he found was that the brain chemicals associated with anxiety and other emotions, including joy and sadness, appeared to be in play in the deep meditative states of Zen practitioners and the prayerful repose of Roman Catholic nuns -- not to mention the mystical trances brought on by users of peyote and other mind-altering drugs.
At least one gene, which goes by the name VMAT2, controls the flow to the brain of chemicals that play a key role in emotions and consciousness. This is the "God gene" of the book's title, and Hamer acknowledges that it's a misnomer. There probably are dozens or hundreds more genes, yet to be identified, involved in the universal propensity for transcendence, he said.
Furthermore, the scientific linkage of a gene with chemicals that affect happiness or sadness does not answer the question "Is there a God?" but rather "Why do we believe in God?"
"Our genes can predispose us to believe. But they don't tell us what to believe in," said Hamer, whose current research involves HIV/AIDS.
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Organized religion can become so codified, so caught up with learned rituals, that the focus on spirituality gets lost, Hamer said. The resurgence of Pentecostalism and other emotion-based religions is one sign of the staying power of inherited spirituality, he said.
Megachurches, too, are part of this phenomenon and have widespread appeal because of the emotional aspects of worship, he said. "They have lots of music, video screens, the whole multimedia thing going on," he said. "They're tapping into that [innate spirituality]. It's fun and allows people to get into that spiritual frame of mind."
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