Simple answer to the OP's question: because religions, like technologies, entertainment, cutsoms, and other human activities, spread.
Why did the Japanese, Koreans, and Chinese adopt Buddhism, which started in India? Why did the North Africans or Indoneasians become Muslims, which
started in the Arabian pennensula? Why did Roman soldiers in Northern England join the Cult of Mithras, which was probably inspired by Persian
thought, or Cult of Isis, out of Egypt? Why did a large number of middle-class Americans in the 1970s become, say, Hare Krishnas? Because ideas spread
and mutate and change. "Information wants to be free," they say. This was no less true millenia ago than it is today.
It's easy to exoticize and idealize a foreign religion because you can cherry-pick its attractive elements and ignore its more negative or tedious
sides. New religions provide new ways of looking at timeless ideas when old religions seem exhausted, faded, jaded, corrupt, or just plain don't work
anymore for whatever reason. Every time a new religion enters a new place, it mutates to adopt to local culture. Japanese Buddhism is very different
from Thai or Tibetan Buddhism. Episcopalian Christianity, Ethiopian Coptic Christianity, Russian Orthodox Christianity, Roman Catholicism, and U.S.
Pentecostalism are all very different creatures, too.
In the specific case of Christianity, the Hebrew God was "internationalized" by the the theory that the "chosen ones" were no longer a small group
of people or tribes, but rather anyone who accepted Christ. God was said to have offered a "New Covenant" through the death and resurrection of
Jesus Christ, and this "new deal," so to speak, re-defined those who were chosen or saved to include anyone who accepted salvation through Christ.
Variations of this idea have been used down through the ages to ease the spread of the religion into new areas.
[edit on 2/7/10 by silent thunder]




