So a religious organization should be forced to hire pedophiles and sodomites as long as they are not "teaching" the children? Food service is a perfect job for a sodomite to gain influence with children. Any and every worker in a religious organization surely should be judged by the content of their character no matter where they "serve" in that organization!
So, does that apply to food service workers?
It's a little more ambiguous, but I'd say yes. Simply on the grounds that the Church-related employer has the right to define what they consider to be ministerial. The government is simply not in a position to make that definition.
So if the Church-related school says "We say that ALL our employees are part of our ministry" -- then that's the way it is, becase they have the say-so.