The ecumenical movement, the uniting of differing religious groups, has been under way for some years now, and is rapidly growing in strength. The "body of Christ," they say, should not be divided. "This movement toward co-operation has become the most striking feature of the life of the churches in the twentieth century." (B. K. Kuiper, The Church in History, Wm. B. Eerdmans Publishing Co., 1996, p. 394.) And now, in the twenty-first century, ecumenism is even stronger.