In the same way also he took the cup, after supper, saying, "This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me." For as often as you eat this bread and drink the cup, you proclaim the Lord's death until he comes. 1 Cor 11:25-26
has made us competent to be ministers of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life. 2 Cor 3:6
You forget my friend that Jesus said that only the few find the narrow way [in this earth] , God needs but 144,000 as minsters , that is about 200,alive at any one time in the whole earth who have baptism of the spirit and so come to know ALL TRUTH of God ...
So clearly one is not equipped to minister unless one knows all the truth to be able to give it [and to be able to defeat Satan's wily temptations and so stop sinning ... for a single sin is enough to separate a man from God, and only past sins can be forgiven, so one is not one of the FEW , the saints, if one dies a sinner ...
So you need to look at who is baptised now and who is baptised after the second resurrection [since God has promised to baptise all men, but many died withou knowing all truth already ,as sinners]
Now this may be interpreted allegorically: these women are two covenants. One is from Mount Sinai, bearing children for slavery; she is Hagar. Now Hagar is Mount Sinai in Arabia; she corresponds to the present Jerusalem, for she is in slavery with her children. But the Jerusalem above is free, and she is our mother. Gal 4:24-26
Why not read what God says instead, BOTH the TWO covenants are with ONLY Israel, the first with undivided Israel, the second with the TWO Houses into which Israel was divided, the House of Judah [Jews] and the lost paganised House of Isralel [scattered amongst the gentiles for millenia and never accepting Judaism, never beconing Jews even after they lost their lands ]
BOTH covenant sare with Israel, and no-one else , God says it through paul and through Jeremiah , read it[ Hebrews 8:3-13, Jer 31:31-34 ]