Yes.
And every day or so the Texas border officers found Arabic Korans in the garbage piles left behind by illegal border crossers. Why would Muslims who went to all the trouble of sneaking across Central America or Mexico to go across the border be honest and gentle people trying to get a better life and education?
MUCH more likely they meet with other Arabs in sleeper cell groups in places scattered all over the country.
Why would they leave their Korans behind?
Were they going to pass as Guatemalans if caught?
No one would figure out they were Arabic if they didn’t have a Koran on them?