The problem is that we are not under the Old Law (Romans 6:14). We cannot be justified by the Law of Moses (Acts of the Apostles 13:39). Colossians 2:16 makes it clear that we are not to let anyone judge us according to Sabbath days. The New Covenant has made the First Covenant old (Hebrews 8:13). Hebrews 7:12 says the law has changed. Romans 7:6 says, “we should serve in newness of spirit, and not in the oldness of the letter.”. In Acts chapter 15: At the Jerusalem council, the apostles addressed the issue about certain Jews were trying to deceive Gentile Christians into thinking they had to be circumcised and keep the Law of Moses (Which would include the Sabbath) otherwise they would not be saved. The apostles concluded that they gave the Gentile Christians no such commandment (See: Acts of the Apostles 15:1, Acts of the Apostles 15:5, Acts of the Apostles 15:24).
This is not the same thing as the laws of Christ. For Paul said, “To those without the law I became like one without the law” (not being without the law of God, but under the law(s) of Christ) (See 1 Corinthians 9:21). Paul said if you seek to be circumcised, Christ will profit you nothing (Galatians 5:2). Then Paul says if you seek to be justified by the law, you have fallen from grace (Galatians 5:4). Meaning, the Old Law is no longer a requirement (i.e. the 613 Laws of Moses), but the many commands that come from Jesus Christ and His followers in the New Testament are a requirement (after we are first saved by God’s grace and mercy).
Anyways, some SDA’s I read about online believe that you eventually have to accept the Saturday Sabbath or you will not be saved. They believe that you can be saved now, but there will be a time when you must come to accept worshiping on the Saturday Sabbath or you will not be saved. Some SDA’s even see Sunday worship as the mark of the beast. So when I have talked with SDA’s on another forum, and we were talking about some other Christian topic, they would keep changing the topic to talk about the Sabbath as if that was the most important thing ever. No doubt because some of them think it will one day be a salvation issue for you. But they should talk about Jesus Christ who is our real rest. For Christ is everything. For it is Christ in you, the hope of glory who saves (Colossians 1:27), and it’s not the Sabbath. The Sabbath was a requirement under the Old Covenant. But we are not under the Old Covenant. We are under the New Covenant with new commands.