I still can't understand why YOU think that he can't work Saturdays. Do you know any Christians who have jobs where they have to work on Sunday? Why would this be any different? Or are you saying that ALL Jews, without exception, will NEVER work on a Saturday?
What about Jews serving in the military? Do you think a commanding officer will allow someone to avoid their duties, such as defending our nation, just because it's Saturday? If that were the case, why isn't Israel invaded every Friday after sunset? The attackers would have 24 hours to tear things up before they'd be a response.