Christianity or Christianities?
“It may be difficult to imagine a religious phenomenon more diverse than modern day Chistianity. There are Roman Catholic missionaries in developing countries who devote themselves to voluntary poverty for the sake of others, and evangelical televangelists who run twelve-step programs to ensure financial success. There are New England Presbyterians and Appalachian snake handlers. There are Greek Orthodox priests committed to the liturgical service of God, replete with set prayers, incantations, and incense, and fundamentalist preachers who view high-church liturgy as demonic invention. There are liberal Methodist political activists intent on transforming society, and Pentecostals who think that society will soon come to a crashing halt with the return of Jesus. And there are the followers of David Keresh — still today–who think the world has already started to end, beginning with the events at Waco, a fulfillment of prophecies from Revelation. Many of these Christian groups, of course, refuse to consider other such groups Christian.
All this diversity of belief and practice, and the intolerance that occasionally results, makes it difficult to know whether we should think of Christianity as one thing or lots of things, whether we should speak of Christianity or Christianities.
What could be more diverse than this variegated phenomenon, Christianity in the modern world? In fact, there may be the answer: Christianity in the ancient world. As historians have come to realize, during the first three Christian centuries, the practices and beliefs found among people who called themselves Christian were so varied that the differences between Roman Catholics, Primitive Baptists, and Seventh-Day Adventists pale by comparison?” — Erhman, Lost Chriatianities