Book excerpt: Christianity's demographics, vitality, and influence have tipped markedly toward the global South and East. Addressing this seismic shift, one of America's leading church historians shows how studying world Christianity changed and enriched his understanding of the nature of the faith as well as of its history. Mark Noll illustrates the riches awaiting anyone who gains even a preliminary understanding of the diverse histories that make up the Christian story. He shows how coming to view human culture as created by God was an important gift he received from the historical study of world Christian diversity, which then led him to a deeper theological understanding of Christianity itself. He also offers advice to students who sense a call to a learned vocation. This is the third book in the Turning South series, which offers reflections by eminent Christian scholars who have turned their attention and commitments beyond North America.