If anyone, including Christians, could follow the 10 commandments perfectly, they would have no need of the Savior Jesus Christ. Praise God that God has sent the Savior because He knows we are incapable of keeping His commandments!
Colossians 2:16-23 Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. (17) These are a shadow of the things to come, but the substance belongs to Christ. (18) Let no one disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by his sensuous mind, (19) and not holding fast to the Head, from whom the whole body, nourished and knit together through its joints and ligaments, grows with a growth that is from God. (20) If with Christ you died to the elemental spirits of the world, why, as if you were still alive in the world, do you submit to regulations— (21) "Do not handle, Do not taste, Do not touch" (22) (referring to things that all perish as they are used)—according to human precepts and teachings? (23) These have indeed an appearance of wisdom in promoting self-made religion and asceticism and severity to the body, but they are of no value in stopping the indulgence of the flesh.
So guys, what possible reason does any christian have not to observe the sabbath please?
Are you an ancient Israelite under the covenant of Law? Are you trusting your righteousness before God in how well you keep the Law?
I am not saying that the Law no longer applies or that it has been abolished, nor that we will be held accountable to the Law. But Jesus Christ fulfilled the Law and if anyone is in Christ, then they too have fulfilled the Law, because they are imputed with the righteousness of Christ, not their own.