The United Methodist Church lost one-fourth of its U.S. churches in a recent schism, with conservatives departing over disputes on sexuality and theology. Now, with the approach of its first major legislative gathering in several years, the question is whether the church can avert a similar outcome elsewhere in the world, where about half its members live. The question is particularly acute in Africa, home to the vast majority of United Methodists outside the U.S. Most of its bishops favor staying, but other voices are calling for regional conferences to disaffiliate. At the upcoming General Conference in Charlotte, North Carolina,...