Human beings have never lacked for things to fight over, but for the last two millennia, they have fought the most over ideas involving the divine. Politics, technology, military capacity, and diseases have all played decisive roles in shaping history, yet it is impossible to understand the rise and fall of empires, the clash of civilizations, and the evolving balance of power without appreciating the unique fervor that religion inspires, and the speed with which new religions can spread.
Christianity, a minority sect during much of the Roman Empire, became a world religion with a vast following after the Emperor Constantine converted to it, in the fourth century A.D. Then came Islam, in the seventh century: just a hundred years after Muhammad’s death, in 632, the religion he founded reached beyond the Middle East to Africa, India, and significant parts of Spain and France. The Protestant Reformation of 1517 quickly engulfed half of Europe, migrated to the New World, and fueled the Counter-Reformation in the remaining Catholic states on the Continent—by 1618, the Thirty Years’ War had begun, resulting in the devastation of large swaths of western Europe and the death of some 30 percent of Germany’s population. Every new outburst of religious passion, while producing ecstasy and revelation for some, has disrupted established loyalties, fueled intolerance, and led to violence between the chosen and the damned.
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It may seem, at first glance, that little has changed. A recent cover story in The Economist, titled “The New Wars of Religion,” proclaimed, “Faith will unsettle politics everywhere this century.” Some scholars of religion have found new sport in predicting which religions will gain the most adherents (and upset the most applecarts) during the coming decades. Pentecostalism is one favorite candidate; it is sweeping through Latin America and Africa, already claiming some half-billion followers around the world. Catholicism is vying for the same conservative turf; Pope Benedict XVI’s insistence on stricter religious teachings, though not likely to grow the Church in Boston, appears intended to win more souls in Bogotá and Brazzaville. Islam claims a fifth of the world’s population, and its share is climbing quickly; it is only a matter of time, many believe, before it surpasses Christianity, which is embraced by a third of the world’s population, to become the predominant faith. Hindus and Buddhists together make up 20 percent of the world’s people, and high birthrates in the countries in which they are dominant suggest that this proportion will grow. Some think that other religions will have to make room for Mormonism, an infant compared with many other faiths. (Those others will have ample time to do so—although the Church of Jesus Christ of Latter-Day Saints is growing quickly, it has just 12 million members, half in the United States.) All in all, The Economist forecasts, by mid-century, 80 percent of the world’s people will adhere to one of the major faiths.