A quiet revolution is taking place in America religion, say Brad Christerson and Richard Flory, authors of The Rise of Network Christianity: How Independent Leaders Are Changing the Religious Landscape.

Largely behind the scenes, a group of mostly self-proclaimed “apostles,” leading ministries from North Carolina to Southern California, has attracted millions of followers with promises of direct access to God through signs and wonders.

Their movement, which Christerson and Flory called “Independent Network Charismatic” or “INC” Christianity, has become one of the fastest-growing faith groups in the United States. Apostles like Bill Johnson, Mike Bickle, Cindy Jacobs, Chuck Pierce, and Ché Ahn claim millions of followers. They’re also aided by an army of fellow ministers who fall under their “spiritual covering.”

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