Acts 15, Gentiles, and the Sabbath

Acts 15 includes the following
"For Moses from ancient generations has in every city those who preach him, since he is read in the synagogues every Sabbath." (Act 15:21)
This shows the Gentiles were keeping the Sabbath which is why the Jews even know who they were. In fact, Acts 15 doesn't make sense at all if the Gentile Christians had set up shop on a different day of the week and had no relationship to Judaism whatsoever. In reality, the Sabbath has always been for all mankind. Please click this link to learn about that and why the Sabbath is supposed to be kept today by Christians.
https://firstcenturychristianity.net/the-sabbath-is-for-all-mankind/