Christianity has never been a monolithic movement. From its beginning, at least four groups were active in its mission, and each addressed itself to a particular ethnic segment of the Roman Empire. The Twelve of Galilee, under Peter, went to Galilee and beyond, to the village culture existing there. The Brethren, under James, addressed themselves to "Hebrews" -- Jews who spoke Aramaic in their homes, used Hebrew in their synagogues, and tended to isolate themselves from the prevailing Greek ...