It's hard to tell, really, from the little information given, whether this is systemic discrimination or not. I mean, did NCL only have 7 Muslim employees from the Middle East on staff, and all were fired. Or do they have dozens and dozens of Middle Eastern/Muslim employees, and something indicated that these 7 were a security risk. That's what it really comes down to. Also, how many other people of various nationalities and religions were casualties of "probationary period dismissal" during that time frame?

Impossible to say one way or the other without any facts or stats!