Mere Christianity by C. S. Lewis is a theological book that provides an explanation and defense of the Christian faith. Lewis discusses the commonalities that unify nearly all Christians at all times.
James Martin, C. S. Lewis, N. T. Wright, Desmond Tutu, Mpho Tutu, Catherine Wolff, Ann Patchett, Candida Moss, John Dominic Crossan, Father Jonathan Morris & Thomas H. Groome