Explains it a second time:
No.
1) The New Testament does not "supersede" the Old Testament, it isn't even "primary". The Old and New Testament are just ... Scripture. It's completely continuous, just as your body is completely continuous, even though it has parts. The head is symbolically primary over the body, but it is not
actually primary in the sense that the head could exist without the body. Obviously, it can't. Jesus said, in essence, "If you believe the Scriptures (Old Testament), then you must believe in me, because I am sent by the Father." (John 10:30, 5:39, etc.) Therefore, the New Testament (the teachings of Jesus)
flows from the Old Testament, it does not "supersede" it.
2) The church does not in any sense "replace" God's chosen people after the flesh. The amount of confusion on this point is staggering, even though the New Testament is pretty clear on it (read Romans, Galatians and Hebrews). Rather, we learn in Romans 11 that Gentile believers are "grafted in" to the covenants, along with Israel, which is the trunk of the olive tree. The natural branches must also be grafted back in (they must believe in Jesus to be saved, John 14:6), nevertheless, there is one distinction remaining --- that they are
natural branches, rather than wild. This distinction does not mitigate against our oneness in Christ (Gal. 3:28, etc.) Nevertheless, it is an
actual distinction, just as skin color is an actual distinction, even though we are all one race as children of Adam. This distinction matters not in respect to
salvation, but in respect to
prophecy -- see again Romans 11 and all the OT prophets.
It also matters in respect to the identity of Jesus the Messiah ---- we know who the Messiah is in part because we know what Jews are. Jesus was prophesied to come from the line of David, a Jew, and this is part of the historical and logical foundation for Jesus's claims about himself. Take away the natural/wild distinction, and you take away the claims of Jesus. Thus, hidden within the supremacy of Jesus is the natural/wild distinction in respect to the eternal covenants of God. This is why, even though salvation is only in Jesus, the Old Testament covenants are all
eternal covenants. Jesus is what makes them eternal, but they ARE eternal, that is, they are eternal covenants
with God's chosen people. If we say that those covenants no longer apply to the chosen people after the flesh but, rather, to the church instead, then we make God into a word-gamer and a deceiver. That would be blasphemy, so it is impossible. Stated another way, if you believe heaven is forever, then God's covenants with his chosen people after the flesh are
also forever because
that's what he said. It's both or neither...
1Chr 16:15,17; 2Chr 13:5,21:7; 2Sam 23:5; Deu 7:9; Exo 31:16; Eze 16:60, 37:26; Gen 17:7,9,13,19, 9:12; Isa 24:5, 55:3, 59:21, 61:8; Jer 32:40, 50:5; Josh 4:7; Lev 24:8; Num 18:19, 25:13; Psa 105:10, 8, 111:5,9