Scholars use the concept of World Christianity both to account for the growth of Christianity beyond Western Christendom and to recognize the changing map of vitality and leadership within Christian churches beyond the European and North American context. Scholars who use this concept have also committed to documenting the history of all of the churches around the world, making special efforts thereby not only to note the contributions of founders and missionary agencies, but also to investigate the important input of local teachers, evangelists, and pastors, so that a more inclusive history may be made available to these faith communities for their own self-understanding and direction. The spread of Christianity beyond the borders of Europe, a subject once envisioned by Kenneth Latourette as the result of the great century of missionary advance, cannot be understood solely as the accomplishment of the Protestant and Roman Catholic missionaries sent from western Europe and North America. Through all the centuries of Christian expansion and migration, scholars need to document and explain not only the theological foundations of various faith traditions, but also how multiple Christianities have adapted and thrived and become rooted in multiple cultural contexts, and exhibit a special vibrancy today in the postcolonial, post-missionary churches in Africa and Asia. Luther’s influence on the rise of World Christianities is an important element in the vitality of contemporary churches in Africa and Asia, but his theological contribution to Christianity beyond the West awaits a fuller articulation and application to the questions and concerns of these emerging centers of Christianity.