One measure of the decline of mainline social justice activism can be found in a recent Facebook exchange between the Methodist civil rights leader Maxie Dunnam and the Methodist civil rights official Bill Mefford. Dunnam was a heroic opponent of Jim Crow as a young pastor in Mississippi and went on to become the president of Asbury Theological Seminary. He also happens to believe in the historic Christian understanding of marriage, so in response to Obergefell v. Hodges, he made the following post on his Facebook wall:To which Mefford, the “Director of Civil and Human Rights” for the United...