We have to be careful to explain what we mean when we say “keep the Commandments any more”. If we say that we are not saved by keeping commandments you are right. We are saved by God’s grace through faith in Jesus because Jesus followed the law perfectly for us.
When we have faith in Jesus we are credited with his righteousness, so God’s demand in the Mosaic covenant to keep the law perfectly has been satisfied (we are saved by Christ’s keeping, not our own’s and we receive it by faith).
just as Abraham “believed God, and it was counted to him as righteousness”? Know then that it is those of faith who are the sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “In you shall all the nations be blessed.” So then, those who are of faith are blessed along with Abraham, the man of faith. For all who rely on works of the law are under a curse; for it is written, “Cursed be everyone who does not abide by all things written in the Book of the Law, and do them.”
Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, “Cursed is everyone who is hanged on a tree”— so that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we might receive the promised Spiritthrough faith.
As Christians we try to keep the moral laws because we love him and we desire to do his will just like Jesus, but we do not earn salvation by keeping the law.
I think what most people mean is that we do not have to adhere to the ceremonial laws and civil laws given to Israel, since Israel is finished. There were laws that were only intended to be in use under the nation Israel.
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. These are a shadow of the things to come, but the substance belongs to Christ.
Now if someone means that we do not have to keep the moral law and we can worship any way that we want, or that God is not bothered in our relationship when we sin.. it is because they do no know God to begin with. That person would be an antinomian (antinomianism is the name of that err).
“If you love me, keep my commands.