The only problem is that God will tell the Sabbatarians that they were more interested in RESTING than in working for Him.
Col. 1:14 In whom we have redemption through his blood,(life) even the forgiveness of sins:
15 Who is the image of the invisible God, the firstborn of every creature:
16 For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
This says Jesus created the Sabbath before becoming a man. And Jesus confirmed this in Mark 2:28 Therefore the Son of man is Lord also of the Sabbath.
And it also means Jesus created the Sabbath for Himself. Jesus confirmed this in: Mark 2:27 And he said unto them, The sabbath was made for man, and not man for the Sabbath:
This is why Jesus honored the Sabbath. He created it for man, and He was, like you and I are, a man. This is also why Paul, Peter, and the Gentiles honored God by obedience to the Commandment created by Jesus for them.
If it were not for mainstream church tradition, this would be a no-brainer. There is nowhere in the Bible which preaches we are to reject God's creation, and create our own. Only those "many who Come in Christ's Name" preach against God's Sabbath. The Word of God does not.