There is no argument in the world of religion over which day the Old Testament reveals Israel was to keep holy. Jesus kept it. What is one supposed to think - that God goes to all the trouble to record all that information about the Sabbath in the Old Testament, and then after four thousand years, He has second thoughts and changes one of His royal laws? He changed no other law of that rank, so why that one? That demands an answer, especially since God-in-the-flesh kept it.
If anyone knew how to live life in a way that would please God, it was His Son, Jesus Christ, who never committed a sin. He kept the Sabbath. It was His custom, not only to keep it, but it was also to fellowship with His fellow Israelites and to read and expound Scripture to them (see Luke 4).
Do we worship some kind of unstable God? How can we have faith in Him and His way, if we fear that God might have changed something and we are not aware of it?
The truth about those ceremonies, rituals, and laws is not done away. Jesus' own testimony to this effect is found in Matthew 5:17-18, "Not one jot or tittle will pass from the law." They are still in effect but elevated to their spiritual application. The Head of the church, the One whose example His disciples are to follow in all things, kept the Sabbath. He did not keep it because He was a Jew but because the Word of God - the Old Testament - instructed Him to do so, and He set an example for His followers.