To Islam?
Sure.
That's just it --- if they're Muslim, they're loyal to the mullahs and to the Koran but cannot be loyal to the USA.
"Are American Arabs Loyal?"
Most are Not loyal to Islam.
Most Arabs living in the U.S. are Christian.
(Many Christians from what's now Syria and Lebanon immigrated in after WWI. There are Maronites from Syria or Lebanon, Coptics from Egypt, among others).
"It is difficult to find even ballpark estimates of Arabs in America. Recent estimates range from 2 to 3 million, of whom 1.4 to 2.1 million would be Christians."
http://www.christianitytoday.com/ct/2004/004/2.38.html