Ecclesiastes 12:14: God will call every creature to account for everything unknown, be it good or bad. The sum of the matter, when all is said and done: Revere God and observe His commandments! For this applies to all mankind.
Matthew 5:17
"Do not think that I have come to abolish the Law of Moses or the writngs of the prophets. No, I came to accomplish their purpose. (as should everyone)
Matthew 5:18
"I tell you the truth, until heaven and earth disappear, not the smallest detail of God’s Law will disappear until it’s purpose is achieved. (at the end of time) So if you ignore the least commandments and teach others to do the same, you will be called the least in the Kingdom of Heaven. But anyone who obeys God’s Law’s and teaches them, will be called great in the Kingdom of Heaven.
Matthew 8:22
‘We prophesied in your name and cast out demons in your name.’ But I will reply ‘I never knew you. Get away from me, you who break God’s laws.’
Matthew 19: 17
“if you want to receive eternal life, keep the commandments.”
Sure, that is definitely one side of the argument. The other is captured in the verses below (among many others). Essentially, the law of agape supersedes the law of sin and death. That is the essence of Christian theology. That doesn’t mean we throw out the Old Testament…not at all. But it is simply inferior to the teachings and example of Christ, to the Christian praxis of compassion-in-action, and to the guidance of holy spirit. You can believe otherwise, insisting that the Old Testament is somehow equivalent to Christ’s “fulfillment of the law,” but I honestly think that is an error. Be that as it may, plenty of folks would agree with you.
Here are some verses that offer a counterpoint to the ones you quoted (and I would pay particular attention to the excerpt from Hebrews):
Matthew 9:17,Mark 2:22,Luke 5:37-39: “And no one puts new wine into old wineskins. If he does, the new wine will burst the skins and it will be spilled, and the skins will be destroyed. But new wine must be put into fresh wineskins. And no one after drinking old wine desires new, for he says, ‘The old is good.’”
Romans 8:2–4: “For the law of the Spirit of life has set you free in Christ Jesus from the law of sin and death. For God has done what the law, weakened by the flesh, could not do. By sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh, in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit.”
Romans 6:14: “For sin will have no dominion over you, since you are not under law but under grace.”
Hebrews 8:6–7: “But as it is, Christ has obtained a ministry that is as much more excellent than the old as the covenant he mediates is better, since it is enacted on better promises. For if that first covenant had been faultless, there would have been no occasion to look for a second.”
Galatians 3:23–25: “Now before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed. So then, the law was our guardian until Christ came, in order that we might be justified by faith. But now that faith has come, we are no longer under a guardian.”
John 13:34–35: “A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another. By this all people will know that you are my disciples, if you have love for one another.”
My 2 cents
