Really, Concerned Citizen?  If they're cancelling some Friday afternoon classes to facilitate Islamic prayers...the question is WHY?  

OK, OK, you want Islamic prayers (any time, any day, multiple times a day,) why not?  I mean, what harm to anybody?  Except...to the Muslim students themselves.  Academically, at least.  See, the thing is...allow this freedom, while allow the other students the convenience, the "freedom" to come to classes AS SCHEDULED.  Only half the kids show up?  Those that aren't praying benefit from a terrific teacher/pupil ratio.  Materials made available to Muslims at the next class (they choose to attend.) Tests and quizzes as usual. 

Muslim kids miss out?  Well, they made the choice.  That's freedom, too.  No remedial lessons.  No "extra curricular" catch-up other than what ALL kids are eligible for.  That's equality. 

Biggest lesson in life: choices come with consequences. If that means low grades for Muslim kids, so be it.  

Next.