I seriously doubt that gentile employees kept their ham sandwiches separated from Jewish employees’chopped liver in company refrigerators up to the present day. Besides, not a few Jews eat ham sandwiches. So perhaps not a few Muslims are closet BLT fanciers.
One of my son’s closest friends is a muslim. My son tells me that his friend told him that during Ramadan, he tries not to eat pork during daylight hours.
Oh, I think we all know what "certain faiths" might happen to be.
Not Jewish. I've never worked with a Jewish person who cared.
Not Hindu or Sikh, they don't care either. Even if they are vegetarian.
I'm NOT struggling to guess just what the "certain faiths" might possibly be.
So just to be safe, make sure the YOU adapt to the rigors of the "certain faith's" dietary rules.
It's the only way to be sure.