Exactly. But even more serious than being dead-weight, those are the people that are going to get us killed because of their inability to recognize that evil flourishes, sometimes in the form of evil religions.
I might be wrong of course but I think evil flourishes best in religion (like germs in a damp bathcloth)...and Islam is evil.
I also think that Good flourishes in religion. Just my opinion, of course, but I put my money (spiritual money that is) behind Yeshua.