Let me put a little finer point on it. What the Jews were told to do on the sabbath was to stay in their homes (Ex. 16.29) and remember the sabbath in this fashion: “And thou shalt remember that thou wast a servant in the land of Egypt, and Jehovah thy God brought thee out thence by a mighty hand and by an outstretched arm: therefore Jehovah thy God commanded thee to keep the sabbath day.”
Yet SDAs, very fine people, don’t stay in their homes, and they don’t remember that God brought them of Egypt miraculously. Instead, they “go to church,” which God never told the Jews.
You seem hung up on the SDAs. Instead of casting rocks at them why not clean your own house and take care of your own salvation? You’re not looking to improve your relationship with God or change your worship habits, you’re wanting to feel superior to somebody else. That is not what God wants.
In Exodus 31, God tells the Children of Israel, “This will be a sign between Me and you” and “It will be a sign between Me and the Israelites forever” which was always understood by Jews to indicate non-Jews had no such specific obligation.