All is fulfilled; the everlasting future is now. The old heaven and earth are swept away and the new ones forever established. That is, the authority of the temple, of the Law, of Moses, has been ceded to the authority of Christ.
Christianity has replaced Judaism. In the first century, the temple cult was on its way out.
As glorious as Moses’ Law was when God delivered it, it had been corrupted, and its time was destined to end (2 Cor 3:7-11). So Israel’s Messiah came to fulfill it (Mt 5:17). He came to do what the Law of Moses could not do: to deliver Israel from her sin and death and reconcile her with God.
Jewish law was law for the Jewish people. Christian law is for Christians, ensconced magnificently in the two commandments of the Lord. Moses himself declared that the statutes and rules he spoke of were for Israel (Dt 5:1-5).
That old Jewish system was enslavement. Christ had delivered the heavenly Jerusalem. The kingdom of God.
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 4:25-26).
In Catholicism and Protestantism, who is the head? Christ.
In Judaism and Christianity, who were/are the heads? Moses for one; Christ for the other.
Big difference.