That is complete nonsense alien to more than 17 centuries of historical orthodox Christian doctrine.
I'm not sure how much you know or how versed you are in Christian doctrine. But what I said is true, and easily defended. The Old Covenant is the agreement (covenant) between Yahweh and the descendants of Jacob, made at Mt. Horeb, where Yahweh gave Moses the Ten Commandments. The agreement can be summarized in the following manner: "I will be a god for you and you will be a people for me." The meaning of this is understood from within the state of theological belief as it existed in ancient times.
In summary, the ancient peoples knew nothing of a transcendent creator of all that exists. Rather it was understood that certain reality-shaping forces existed, and some of these were the gods. Each god was relegated to a particular sphere of influence on the earth. Each nation had a god to bless them and protect them from enemies and make them victorious in battle. The "god" took the local people as "his people."
Within that context then, Yahweh would agree to be a god for Israel if Israel would agree to be a people for him. This is essentially the covenant that God made with Israel at Mt. Horeb.
What Christians call the OT, is a collection of writings, organized into three sections: 1) The Law, 2) The prophets, and 3) The writings. The Law consists of the first five books of the Bible known as the Pentateuch. The rest of the OT contains records of the Prophetic word, the history of Israel, the Psalms, and other writings. Jesus often referred to the Hebrew scriptures as "The Law", or at other times, "The Law and the Prophets." Here are a couple of examples.
Matthew 22:37-40
And He said to him, “‘You shall love the Lord your God with all your heart, and with all your soul, and with all your mind.’ This is the great and foremost commandment. The second is like it, ‘You shall love your neighbor as yourself.’ On these two commandments depend the whole Law and the Prophets.”
According to Jesus, both the Law and the Prophets are reliable sources of information with regard to the Biblical concept: eusebeia - A proper regard for God. And of utmost importance in that regard is to "Love the Lord your God with all your heart, and with all your soul, and with all your mind." If Jesus said that the Law and the prophets were an important source of that information, who are we to disagree with him?
Secondly, consider this passage.
Luke 24:44
Now He said to them, “These are My words which I spoke to you while I was still with you, that all things which are written about Me in the Law of Moses and the Prophets and the Psalms must be fulfilled.”
Here Jesus lists the entire Hebrew scriptures, "The Law", "The Prophets," and "The Psalms" in order to suggest that in order to understand Jesus' words, one would do well to study the Hebrew writings because, in these, one can find information concerning the coming Messiah.
If Jesus commended the Hebrew scriptures, then so do I.
Tell God that His Son's New Will and Testament isn't a New Will and Testament, and that the Scriptures below are false.
Why would I do that?
Let us know what He says.
Hebrews 9
15 And for this cause he is the
mediator of the new testament, that
by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
16 For where a testament is, there must also of necessity be the
death of the testator.
17 For a
testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.
Hebrews 10
9 Then said he, Lo, I come to do thy will, O God. He
taketh away the first, that he may establish the second.
Hebrews 8
13 In that he saith, A
new covenant, he hath
made the first old. Now that which decayeth and waxeth old is ready to
vanish away.
He does not need to argue that OT covenants are nullified, because the nullification of all aspects of an old testament by a new testament is inherent in the jurisprudential definiton and characteristics of a testament. The OT covenants are clauses within the OT. They are nullified by the nullification of the OT which contains them.
Perhaps you didn't notice but Paul's reference to an Old Covenant is a reference to the Covenant at Mt. Horeb exclusively. Paul never argues that the New Covenant nullifies every other covenant God has made.