To take it further... why is Sunday the last day of the week in all of those countries? (Of course, my point is, Sunday is the day off, the last day of the wee

To take it further... why is Sunday the last day of the week in all of those countries? (Of course, my point is, Sunday is the day off, the last day of the week, and the "core" of the weekend, exactly because of the dominant religion.)