Do Christians observe the Sabbath and not just Jews?
No, Christians do not observe the Sabbath. There are people who will argue “Yes,” and use Isaiah 56:6 that Gentiles can also participate in the Sabbath and not just Jews.
However, the Bible shows that this verse is talking about at a future time period, when Jesus Christ will rule over a kingdom on the earth in Israel.
So, because of that, all the Gentile Nations have to come to Jerusalem and worship Him.
Obviously, that’s not our timeline right now.
In Isaiah 66:19-20, notice that all the Gentiles will go to Jerusalem to worship God when He rules as King of kings and Lord of lords on the earth.
In Colossians 2 even, which is a verse for Christians, they are not to be judged for not observing the Sabbath because
Paul said that the Sabbath in Colossians 2:16-17, Sabbath days, are a shadow of things to come.
It is a timeline set for the future.