Most Arabs are Catholic or Orthodox. I would not worry about them. I know on 9/11, many Muslims who were killed were mainly Bengali, Persians, and Indians.
All of our 256 living in our now five generation deep Arabic family are Catholic.
However, there are no longer a lot of Catholics in Arab contries like there were 100 years ago. Islamic fanatics have murdered most of the remaining Catholics, or Arab Catholics have fled to America or other nations.
That means that a high percentage of the immigrants and illegal alien terrorists coming in from Arab countries are Muslim.