In 2002, God dropped a pebble into the pond of Kay Warren's life in the form of a magazine article about HIV/AIDS in Africa. Three years later, the ripple effect has reached all the way from her home in Orange County, California, to Africa. It's still gaining strength through the PEACE plan, a bold ministry vision from Kay's influential husband, Saddleback Church's Rick Warren. I traveled to Kigali, Rwanda, with the Warrens and 42 other American evangelicals in July, where they joined 9,000 Rwandan Christians in launching the first "Purpose-Driven Nation" initiative to harness businesspeople, politicians, and pastors against the...