Question - does the Christian conduct of the Shabbat include a ban only on work, or on any activity? Just the Jewish Shabbat is enough ... tiresome (I got the impression). Moreover, not all people are religious. In addition, the gospel says - "not a man for the Saturday (Shabbat), but Saturday for a man."
The “ban” is on work and commerce, not so much on peripheral activity as would be common in Orthodox Jewish communities. Think “Blue Laws.” The United States more or less operated on such a basis for most of its existence in OTL.
That being said, there are secular benefits to a guaranteed day off. Most of Europe has similar laws regarding commerce on Sunday. But if you’re thinking policemen are knocking on the doors of houses on Sunday afternoons making sure they aren’t doing anything defined as “work,” it’s nowhere near that.