I have not really looked at a Bible in a long time, but does it really say that? I think I remember it being mostly Sabbath day and many different religions consider the Sabbath to be on different days, especially consider they do not all use the same calendar (e.g. Russian Orthodox uses the Julian, or at least did for a while, and December 25 in the Julian Calendar falls in January in the Gregorian calendar).
Plus, we cannot really function 24/7, obviously, so rest is necessary
As for whether religion is useless, which is the topic at hand, I would say that it currently is.
While it does give some people relief about death, it feels useless because you can find a community anywhere, especially considering we have forums, applications like Discord, and even sites to help people with common interests gather together.
From my own experience, religion is just a hot bed for self loathing and the kind of apathy that you would find in cults and MLMs, which is not conducive for having good moral standards.