It has been long held since early Christian times as part of the justification for the 8th day worship on Sunday. You can also criticize the early Christian understanding but that was it. A major example is found in the writing of the preacher Barnabas ( not the friend of Paul ) from around 100 AD.
Plus the earliest known church manual( from before 100 AD), the Didache, which focuses on the Lord’s commandments in it’s 2nd chapter expresses the commandments various sources in the law, prophets, & prophets ( there is no emphasis on the Saturday sabbath here).
Do not murder [cf. Exod. 20:15(13)].
Do not commit adultery [Exod. 20:13 (14)].
Do not be sexually perverted.
Do not be sexually promiscuous [f. Deut. 23:17ff. ].
Do not steal [cf. Exod. 20:14(15)].
Do not practice magic [see Deut. 18:10f.].
Do not engage in sorceries [see Deut. 18:10f.].
Do not murder a child by abortion, nor kill it at birth.
Do not desire your neighbor's things [see Exod. 20:171.
3. Do not be an oath breaker [see LXX Zech.
Do not give false testimony [cf. Exod. 20:16; Matt. 5:33].
Do not speak evilly [see LXX Prov. 20:13(16)].
Do not bear a grudge [see Prov. 12:28; Zech. 7:10].
- Do not be double-minded nor double-tongued, for the double tongue is a snare of death [cf. Prov. 21:6; James 3:5ff.]:
- Let your word be neither empty nor false but fulfilled in practice.
- Be not greedy [cf. Exod. 20:17), nor a swindler, nor a hypo-crite, nor spiteful, nor conceited. Do not plot wickedly against your neighbor.
- Do not hate any man, but reprove some-and pray for them-and some love more than yourself [cf. Jude 22ff.].
In chapter 14, the Didache mentions the “Lord’s Day” ( Revelation 1:8) as the worship day.
14 On every Lord's Day—his special day
527—come together and break bread and give thanks, first confessing your sins so that your sacrifice may be pure. 2Anyone at variance with his neighbor must not join you, until they are reconciled, lest your sacrifice be defiled. 3For it was of this sacrifice that the Lord said, "Always and everywhere offer me a pure sacrifice; for I am a great King, says the Lord, and my name is marveled at by the nations."
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I would think if the Apostles would have emphasized the Sabbath in Acts 15, the early church groups would have followed it. Some kept the Sabbath but most didn’t. Surely it can be kept according to how a community’s understanding but it is not binding as some claim.