Morgan Guyton's "Capitalism’s war on the Sabbath" does contain a tiny grain of truth. Sadly and predictably he takes that minuscule point and creates a mountain of arrogance laden nonsense. It is true that the form of capitalism that currently dominates the American economy is not labor friendly in any way. It does not, however, directly oppose the idea of a period of rest. It seek to maximize profit by pushing hour of operation and production as much as possible. If it were possible to do that and allow adequate rest Big Business would be fine with providing that. In practice it isn't possible so it does end up undercutting time off for employees.
This isn't really what Guyton is writing about. He makes it clear early on that is views of the "Sabbath" are very biased and ignorant. The idea of a rest-period is not unique to religion and certainly isn't innately Christian. It is the Christian version that he is passing off as a unique and universal concept. Sunday is not the holy day for Jews or Muslims. So, even within the Abrahamic faiths Guyton's take on the Sabbath is half-assed. This bit of nonsense isn't even among the most egregious bits of absurdity penned by him. There are far too many to note them all so I'll just quote one as an example.
"God does not make arbitrary rules for the sake of his honor and glory; God’s commands are for the sake of our flourishing..."
Apparently, he's never paid attention to the two version of the Ten Commandments, or for that matter, many of the Mosaic laws. God himself, according to scripture, makes it clear that many of the rules and rituals are expressly for honoring God. Yes, in fact God does make arbitrary rules. Those rules are interpreted differently not only among the various religions but also within Christianity.