How do the Ten Commandments fit with the Old Covenant? (Seventh Day Adventists)

Seventh Day Adventists are best known for their claim that celebrating the Saturday Sabbath is still binding precisely because the Ten Commandments remain binding. They claim that since the other nine commandments (murder, theft, adultery, etc) remain binding, then we cannot just ignore the Saturday Sabbath commandment. This argument is quite reasonable and one of the most appealing arguments that draws people into becoming SDA. Unless you can address this mindset, it is futile to simply quote to them standard proof-texts such as Colossians 2:16-17 and Galatians 4:9-10. The heart of the SDA error is that the SDAs fail to distinguish between the Ten Commandments being a covenant as opposed to a general moral guideline. 

Is Adoption the real lesson of Rom 4 & Gal 3?

Protestant often emphasize that Justification is a "legal" event, envisioning a defendant standing before a Judge in a courtroom. But they seem to miss the much more obvious and explicit Adoption themes within key Justification texts such as Romans 4 and Galatians 3. In this post, we will take a look at what these two chapters actually have to say about Adoption. 

Romans Ch4: 1 What then shall we say was gained by Abraham, our forefather according to the flesh? 11 He received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised. The purpose was to make him the father of all who believe without being circumcised, so that righteousness would be counted to them as well, 12 and to make him the father of the circumcised who are not merely circumcised but who also walk in the footsteps of the faith that our father Abraham had before he was circumcised. 13 For the promise to Abraham and his offspring that he would be heir of the world did not come through the law. 14 For if it is the adherents of the law who are to be the heirs, faith is null and the promise is void. 16 That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring, not only to the adherent of the law but also to the one who shares the faith of Abraham, who is the father of us all, 17 as it is written, “I have made you the father of many nations” 18 In hope he believed against hope, that he should become the father of many nations, as he had been told, “So shall your offspring be.”

Galatians Ch3: 6 just as Abraham “believed God, and it was counted to him as righteousness” 7 Know then that it is those of faith who are the sons of Abraham. 16 Now the promises were made to Abraham and to his offspring. It does not say, “And to offsprings,” referring to many, but referring to one, “And to your offspring,” who is Christ. 18 For if the inheritance comes by the law, it no longer comes by promise; but God gave it to Abraham by a promise. 26 for in Christ Jesus you are all sons of God, through faith. 29 And if you are Christ's, then you are Abraham's offspring, heirs according to promise.

From the above survey we see the language Paul uses in reference to Abraham is almost entirely Adoption related terminology: father (7), offspring (5), sons (2), heirs (2), inheritance. If you read those chapters, you will see that "legal" language such as "judge" and "condemn" and such is almost entirely absent. And though the term "law" frequently appears, Paul is certainly talking about the Mosaic Law (see HERE), not some Divine Courtroom. And more importantly, Paul is saying the Law is not the path to salvation. Other common terms that are used in these chapters like "works" and "believe" are not legal terms, especially given that faith/believing/forgiveness has nothing to do with a courtroom.