So Jesus cures the curses — all of them — through the cross. We who enter into Jesus through faith in/faithfulness to/trust in Jesus participate in redemption from the curses.
And there is this shift. Before the cross, the curses were against everyone and everything (Gen 3) or against the nation of Israel (Deu 27-28). These were national or group curses.
However, the hanging on a tree curse was highly individualized — and so Jesus suffered an individual curse for all people and the nation of Israel.
To participate in Jesus’ redemptive work is an individual choice. The spiritual Israel is those of the physical Israel with faith in Jesus, plus Gentiles who have faith in Jesus, added by grafting in (Rom 11). We choose whether to have faith individually — one at a time. We are baptized one at a time.
But we believe and are baptized into the Kingdom — a nation — which is blessed as a community. It’s the Kingdom that is elect. It is the Kingdom for whom the new covenant was made. (We greatly distort much of Paul by taking words he borrows from the OT regarding Israel as a nation — such as “election” — and apply these words individualistically.)
The Western mindset is highly individualistic. We have a “personal relationship” with Jesus. We attend the church of our choice. We see Christianity as being about our individual relationship with Jesus and God and the Spirit.
And, admittedly, there is certainly truth in this — but it’s a badly incomplete truth. We also are added to a community, a nation, a Kingdom that God has a relationship with in a community sense. The church isn’t just the set of all individually saved people. Rather, we are individually saved by being added to the saved community, nation, and Kingdom.
This is is one of many reasons that God so insists on Christian unity. His mission to redeem the world cannot be accomplished by individuals acting solely as individuals. There is power and strength in community. There are efficiencies and economies that can only be attained in groups — and these things matter very much to God.
Not only do we need each other to support and encourage each other, the work we’ve been given is too big, too important to take on individually.
This is why the NT refers to the church as a temple for the Holy Spirit. A temple can only exist if the stones are all very tightly joined together. In fact, the Temple in Jerusalem was built with stones carved with such precision that they fit together without mortar. And our walk on earth with Jesus is a time of being fitted for the temple, that is, being shaped by God to so precisely join with our brothers and sisters that no mortar is needed.