During the Eucharist and during Easter we are remembering Jesus.
Jesus said that we should do this in remembrance of him.
He did not say we should do it in remembrance of the passover. (that would be replacement theology)
It is true Jesus was a Jew, living and acting as Jews did.
However what he taught certainly applies to Christian gentiles (and I would suggest that he intended them to apply to Jews too)
When you read the Didache, it is clear that although those first gentile Christians were taught and mentored about the lords prayer, baptism, the Eucharist, and how to respond to their new status as Christians, they were taught nothing about circumcision, Jewish law or other traditions.
In a single generation these new Jewish-Christian communities had devised a training programme for their gentile converts. It formed the new Christian Tradition, that bore little resemblance to its Jewish forebears.
Christianity has done it self no favours by trying to justify itself by Jewish prophecies.
Christianity is fully justified by the Life work, death and resurrection of Jesus.
Replacement theology is an anathema.