I recently heard a testimony that beautifully illustrates this. A synagogue was badly vandalized and burned and the local churches rallied together to support the grief-stricken Jewish community. Money, political action, and physical help in rebuilding the synagogue poured in. Actual acts of love and support demonstrated something to this Jewish community that dropped centuries-old walls of suspicion and distrust. Love can overcome any and all barriers.
Love is the beginning of the church's true testimony to the Jewish people.
Most Christians do not see themselves as having been grafted into God's new covenant with Israel. Because of the redirecting of the Church away from her Jewish roots, gentiles who in actuality receive Israel's Messiah, are made part of the commonwealth of Israel, and are grafted into the Olive Tree of Israel, never even hear about these biblical facts but are made to think in completely gentile terms that omit almost all of their connections with the Jewish people. God desires that the Church be fully reconciled to the Jewish people, so that she will be able to love, support and properly testify to them of their Messiah. The first step in accomplishing this goal is for the Church to see that she is Biblically and spiritually connected to the Jewish people. Quite simply, the blood of the Jewish Messiah and His grafting her into the Olive Tree of Romans 11 has made the Church part of the Jewish nation.