The sabbath was specifically a covenant sign to Israel as part of the Old Covenant.
Which covenant was replaced by the New Covenant. Which in turn begs the question of whether or not it is a New Covenant teaching. Which gives support to questioning or pointing what if anything the NT says or does not say on it.
Paul said to not let anyone judge you in pertaining to Sabbaths as well as other things. They had problems with judaizers.
Circumcision was not a requirement though that preceeded the law.
The Apostolic council, which met to determine what the Gentiles should keep as pertaining to the Law never mentioned the Sabbath though they mentioned blood and foots offered to idols.
Anti-Pas...I summed up our arguments for you when you get back from "resting".....