I think you misunderstand those of us that keep the seventh day Sabbath. Just like you, we don't believe anything we do earns us salvation. We are saved by grace and that is a gift from God. We keep the Sabbath as our Lord and Savior did: not by the strict letter, but we delight in the Sabbath (see Isa. 58:3). We always ask ourselves who gave the Sabbath (Jesus) and when it was given (at creation). Then we deduce that Jesus doesn't change (see Heb. 13:8).
I do not side with the SDA on most issues of prophecy, and I could never belong in their church. But they did get a few things in prophecy right. I tend to not throw the baby out with the bathwater. Our obedience to the law does not save us, but I believe by doing those things God gives us understanding and discernment.
Whatever you personal views on the matter you certainly do not speak for other Sabbatarians!
I have no idea whether you are an Adventist or not, but I can tell you this:
Another Adventist, who has just been banned, had a completely different take, and believed and bluntly stated that non-observance of the Sabbath would result in condemnation by God!
He made it very clear that Sabbath observance was not discretionary in any way.
This is consistent with Adventist theology, which for all PRACTICAL purposes, teaches that Sabbath observance is the Seal of God and that Sunday worship is the Mark of the Beast.
Technically, they believe that the Mark of the Beast will be applied to all who do not obey the commandments of God to the end...
Since, in Adventist theology Sabbath observance, among the other ten commandments, is so prominent, Sunday worship conveniently equals disobedience, the actual final discriminator of salvation becomes Sabbath observance!!!!!
This is most decidedly NOT salvation by grace through faith - this is purely works-salvation, and no sophistry or gloss can change this.
I will also emphasise that the banned individual also proclaimed salvation by grace through faith, he also proclaimed "sola scriptura" despite the fact that Adventist theology is all man-made fantasy concocted by the likes of Hiram Edson, Joseph Bates, Ellen G. White, and others.
Given where they are coming from, I have a hard time believing that ANY Sabbatarian is not a legalist at heart....
Perhaps, you, are that exception.
But that remains to be seen...