On every cruise that Rob and I have been on for either Royal Caribbean or Celebrity, they have always had Friday night services. Once, during Chanukah, Royal Caribbean gave a big Chanukah party including latkas, coins, dreidels, challah and wine. It just so happened that a cantor was aboard the ship. It would be very inappropriate for a cruise director to even say "we don't do Jewish". Cruise directors come up "through the ranks" and in their training, they are taught to be "sensitive" to all races and religions.