There is not one person on these forums that believe we can lie, murder, steal, worship other gods, use God's name in vain and so on without repenting.
As a matter of fact, I do believe we (Xians) *can* do those things without "repenting" and still remain saved, but very few *would*. It's my conviction that the only way a saved person can revert to the unsaved state is by willfully and knowingly repudiating faith in Christ.
Jesus summed up the Law of the Obsolete Covenant as "Love the LORD and love your neighbor." (Interestingly, the second part of that compound commandment is not even part of The Ten.)
Under the New Covenant, those translate to "Believe/trust in Jesus as I AM" and "Love one another / Love your neighbor as yourself." ("Love your neighbor as yourself" is the wording used by James; and repeatedly by Paul, who says it fulfills the *entire* law. "Love one another" is the language used by John, by Jesus as quoted by John, and by Paul -- on one occasion as parallel to "Love your neighbor." John implies "Love one another" is the only commandment now operative.) Faith in Jesus secures us in the New Covenant; acting in love is the identity marker of being in that Covenant.
Sin was nailed on the cross. The law is not sin.
Gal. 3 says that the "curse of the Law" was hung on the "tree." In context, the implication is that the necessity of living under law is a curse in contrast to the life of faith, and so the entire lifestyle of law was crucified.
More explicitly, Eph. 2:15-16 says the Law (not "parts of the Law") of commandments and ordinances was abolished by means of the Cross. Col. 2:14 says certificate of debt consisting of decrees (ordinances) was cancelled and nailed to the Cross.
Romans 14 speaks of doubtful things such as special days for fasting, not the Sabbath.
There is no reason to exclude the sabbath unless you start with that idea in mind. Sabbath observance did not become a Commandment until the institution of the Obsolete Covenant of Sinai. Since we are now under a New and better Covenant, there is no reason to automatically assume it is still in effect. Which things, if any, to carry over from the Obsolete Covenant, and how to do it, all fall under the heading of "doubtful things."
We don't obey God as a means to be accepted. We obey God because we love him and want to worship him.
Agreed. And I choose to worship Him and honor Him by enjoying the full extent of the liberty He purchased for me.
The law is holy, just and good. There's no need to get rid of it.
And yet God saw fit to abolish it at the Cross, since it had served its purpose.