It would be interesting to note whether the Arabs who immigrated converted to Christianity before or after they arrived in the U.S (or came from families that always were Christian).
Our family was Catholic before coming to America. I do not think very many at all converted religions after coming here.
At one time in Lebanon (e.g.), Christians had a high percentage (higher than today's 39%) of the popualtion, but the radical thug Islamics are eradicating others who are of another religion. Even today, the Parliament in Lebanon is evenly split between Christians and Muslims. Population wise, still about 40% are Christian--Maronite Catholic, Greek Orthodox, Melkite Catholic, Armenian Orthodox, Syrian Catholic, Armenian Catholic, Syrian Orthodox, Roman Catholic, Chaldean, Assyrian, Copt, Protestant.