"But 70 percent of Arabs living in America are Christians"
Do you have a source for that?
Half way down the article on the left hand side. There is the box titled :
" Debunking a myth"
http://www.vaildaily.com/article/20061105/NEWS/61106002
" Americans think of Muslims as Arabs and vice versa, said Seeme Hasan, a Pakistan-born Muslim living in the U.S.
But 70 percent of Arabs living in America are Christians, and the largest number of Muslims are in southern Asian countries. "