Scholars of contemporary Christianity rightly stress the enormous worldwide upsurge of Pentecostalism. In numerical terms at least, it represents the greatest success story in modern religion. A new movement just a century ago, Pentecostalism today claims hundreds of millions of adherents.
Much of that story involves demographic change. As populations have swelled in Africa, Asia, and Latin America, many millions have been uprooted from traditional villages.
Philip Jenkins teaches at Penn State and is a Distinguished Senior Fellow at the Institute for Studies of Religion at Baylor University. He is the author of The Great and Holy War and The Many Faces of Christ.