Hi kwamenat...
So are you implying that since murdering, stealing, covetousness, etc are not mentioned then we can go ahead and do it anyways. We cannot use 1 scripture to jump to such a conclusion. I am surprise that many christians are bold to say that the 10 commandments are done away with.
No one implied this at all.
In fact, I previously mentioned that Jesus superseded the commands "Thou shalt not kill" by telling us that the principle forbids anger without cause. "Thou shalt not commit adultery?" Jesus superseded it by telling us that God forbids lust. If you take care of the anger without cause and the lust...you would fulfill the Law without being restricted by the letter thereof.
As for Paul teaching on the Sabbath, this was because his target audience met together on that day. No where under the New Covenant do we find people "confined" to a Sabbath. Believers met DAILY in their homes. Paul preached DAILY. Hebrews 4 tells us that TODAY is the new Sabbath rest for God's people -- and not some particular calendar day (Saturn Day) that has changed through history.
Besides, I have a question for you:
What do YOU think that we are supposed to do on a "Sabbath" day? Specifically?
As believers, we already remember the finished work of God on that day (and EVERY day). We also are supposed to be holy on that day (and EVERY day). Many Westerners avoid going to weekly work -- not just on Saturday, but on Saturday and Sunday (which goes against the "letter of the law" that we should work SIX days a week and rest on only one [Exodus 20:9-10]). Very few people actually work every day of the week.
You asked the question, "Why come most protestants don't keep the 7th day sabbath?" The answer is that most believers do not feel that we are confined to the Law. We feel that we have been liberated from the specific commands by fulfilling the underlying purposes for which God created the Law.
Consider Romans chapter 7:
1 Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?2 For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.
3 So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.
4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
5 For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death.
6 BUT NOW WE ARE DELIVERED FROM THE LAW, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.
Romans 7:1-6
Romans chapters 7 and 8 speak extensively about the Law and how we have been set "free" from it (Romans 8:1-2). As I mentioned previously, the Apostles (in Acts 15) did NOT implore the new Gentile believers to follow the Ten Commandments. Why? Because the Spirit-guiding principles of the law of the spirit of life in Christ Jesus would cause us to fulfill those things. We don't have to be told that we should not commit adultery -- because we are not supposed to lust. We don't have to be told not to murder -- because we are not supposed to harbor anger or bitterness. IF we consider others before ourselves, we will not steal or covet those things that belong to others.
The Sabbath day, according to Jesus, was made FOR man (Mark 2:27). Why? It was a day that would be set aside by which man was to remember the finished work of God. God had completed His work. It was finished. However, our finished work took place at the cross. Jesus died and declared, "IT IS FINISHED!" (John 19:30). We now have a "rest" from God's completed, finished work. Hebrews 4 declares that rest to be "today." This isn't confined to a Saturday or Sunday. This is TODAY.
I am not trying to convince you of anything (and, I suppose, the same is true with you). However, I hope that this helps you understand where many of us are coming from in lieu of your original question.