In my eternal wanderings in the cyberland of ... Cyber, I happened across some ... um, SCHOLARLY discussion of the history of "sabbath" keeping, and thought some might wish to avail themselves of this work cited (in a lengthy article that I feel that most wouldn't want to have to swim to the deep end) and here is the excerpt that refers to a work one might wish to consult for a less emotional view:
".... Another evidence from the mid second century of [continued] Sabbath observance comes from the apocryphal work Acts of John where seventh-day Sabbath is mentioned as being a true “Lord’s day”. …
Theophilus of Antioch, (130- 185 AD) considered a saint by both Catholic and Orthodox Christians, was known to attack the use of icons, immortality of soul and quoted Sabbath as being the Seventh-day appointed by God in the fourth commandment. (Zivadinovic D. REVISED and CORRECTED “SABBATH in the EAST. “Andrews University, c. 2019)"
Of course, I refer to Zivadinovic's work "Sabbath in the East." I'm sure one could search it out on the looker thing if one were inclined.