If we look up the people the High Priest can marry, it will be only a virgin from his own country. To be the Bride of Jesus, our High Priest, we must be "born again" into His family. God is NOT abandoning His family. Read Genesis 24 as a shadow of the Marriage of the Messiah. The servant is the Holy Spirit sent to Abraham's country to get a bride from a relative. Rebekah is the church and Isaac is Jesus.
The Mosaic covenant was with the Law. The Abrahamic covenant was with faith. We are now able to participate in the covenant with Abraham. God made the covenant with Himself, by Himself, for Himself.
When Jesus paid the price we owe, the veil was removed between us and Him, as prophesied in the OT for thousands of years. As prophesied in Zech, Joel, Ezekiel and others, There will be a final battle for Israel in the valley of Meggido where Jesus will come on a white horse to rescue His people from the attackers and they will be put in the "wine press" to cause blood as deep as a horses bridal for 184 miles. All of the Last Days will be for the rescue and conversion of the Jews in Israel. Zech 12:1-14.
Jesus didn't come to start a "new" religion, but to fulfill the one started with Abraham.
To be precise, "Christians" have become Jews and Jews will become "believers". The first church was called "The Way", which just means they understood the Scriptures in a new way. Paul was trained by the "Einstein" of the Pharisees. When Jesus appeared to Him on the road to Damascus, the Scriptures became clear to him about Jesus. The Holy Spirit gives us revelation to understand Scripture. Jesus "breathed" on the Apostles to open up Scripture to them. The Bible is written in such a way that it takes the Holy Spirit to open them up to a believer. First, second, and third readings, don't necessarily open what God is saying for the reader. There is a certain amount of study, not just reading, that is needed. Most Christians are taught by a guy that has a pamphlet from some governing body, that has no training at all. Denominations are the "traditions of men" spoken of in Scripture, so each one will put their slant on whatever they teach.
There are teachers, but you will most likely have to seek them out. Some good ones are Mark Biltz, loveisrael.com, chabad.org, torahclass.com, jewishjesus.com, and many more if you search for them. To try to separate Christianity from the Jews is a mistake of huge proportions. It comes from "replacement theology" which resulted in the Holocaust. Just as an example, theologians translated "synagogue" as a "Jewish gathering. They then translated "church" from ekklesia. The truth is synagogue is a called out assembly and ekklesia means called out assembly in Greek. The truth is the first pagan converts met in a Jewish synagogue with the Jews. By the time of the end of the first century, "Christians" were kicking Jews out of the churches the Apostles had built. 3 John 1:9-10. John was refused entry into a church run by a Greek. That's JOHN, the disciple Jesus loved!!
The good news is that the last 50-60 years relations between Jews and Christians have really gotten better. Maybe it is the realization that there is a lot more in common between the two faith groups.
But did not the seperation started when Paul was on one of his missionary travels,in Greece,there was disruption of the Christian community with the help of the local Jewish synagogue?