First, the Law is one single unit comprised of 613 specific commandments.
Secondly, the whole Law has been rendered inoperative; it is no longer in effect. Even the Ten Commandments no longer apply today.
Thirdly, the Law is still there in the sense that it could be used as a teaching tool to show God's standard of righteousness as well as man's sinfulness and his need for the Messiah. That is the lawful use of the Law.
Galatians 3:23-25
(23) Now before faith came about, we were held in custody and confined under the Law in preparation for the faith that was to be revealed.
(24) And so the Law was our guardian until the Messiah came, so that we might be justified by faith.
(25) But now that faith has come about, we are no longer under a guardian.
Fourthly, that it is no longer the rule of life for the believer, because the believer is no longer under the Law.
Matthew 5:17-19
(17) "Do not think that I came to destroy the Law or the Prophets. I didn't come to destroy them, but to fulfill them,
(18) because I tell you with certainty that until heaven and earth disappear, not one letter or one stroke of a letter will disappear from the Law until everything has been accomplished.
(19) So whoever sets aside one of the least of these commandments and teaches others to do the same will be called least in the kingdom from heaven. But whoever does them and teaches them will be called great in the kingdom from heaven
I gather that you (like every other legalist) like to use this passage against the above conclusions, because Jesus said that He did not come to destroy or to abolish the Law, but to fulfill it. However, six things about this passage should be noted.
First, this is the main passage people like to use to maintain the Sabbath law and other features of the Law.
Secondly, while you emphasize verse 18, you tend to ignore verse 19 which adds: least of these commandments. In other words, the context of Matthew 5:17-19 is not only concerned with the Sabbath law or only the Ten Commandments or only the major laws, but even the most minute laws, all 613 commandments. When verse 19 adds, least of these commandments, it includes the entire Law, all 613 commandments.
Thirdly, the Greek word for "fulfill" is πληρῶσαι, which is used by Matthew in the sense of fulfilling prophecy, thus bringing that prophecy to an end. In Matthew 1:22–23, he used the term of the prophecy of Isaiah 7:14. He does not mean that Isaiah 7:14 can be fulfilled again in the future, he simply means that it is a fulfillment of prophecy, bringing it to an end.
Fourthly, the word means the accomplishment of prophecy by fulfilling it, in contrast to its abolishment by failing to fulfill it. The point of Matthew is that the Messiah came to fulfill, not to abolish.
Fifth, these words were spoken during Jesus' lifetime when the Law was still in effect. As long as He was living, He still had to obey the Law.
Sixth, the Law did not end with the coming of Jesus. It ended with the His death. It was then that Law was rendered inoperative.
Revelation 12:17
(17) The dragon became angry with the woman and went away to do battle against the rest of her children, the ones who keep God's commandments and hold on to the testimony about Jesus.
This verse is saying that Satan will war against two groups of Jews in particular:
1. Those who keep God's commandments, the Orthodox Jews; and
2. Those who hold on to the testimony of Jesus, the believing Jewish Remnant of the Tribulation, as well as the 144,000 Jewish evangelists of Revelation 7.
Please, correct exegesis.