Eph 2:15,16   His purpose was to create in himself one new man out of the two, thus making peace, and in this one body to reconcile both of them to God through the cross

      

Prior to Christ, God's people had been the Jews. Having said that, many of them appeared to pay little more than lip service to Him. However, there were those who were keeping God's law and even being led by His Spirit (Lk 1:6, 2:26,27), so there were faithful ones in the midst of not-so-faithful ones! They had been reconciled to God through the sacrificial system.

 

When Christ came and the Spirit came on the day of Pentecost, new people of God were those who committed their lives purposefully to God on the basis of the work of Christ on the Cross, and were indwelt by the Spirit. They were reconciled to God through Christ's death for them.

 

From that point on all believers were reconciled to God through the work of the Cross. Now both Jew & Gentile came to God through the same way. The two were thus made into one new body. From then on, the church, all the believers, were called the body of Christ (Eph 1:22,23), i.e. both Jewish believers and Gentile believers were all part of this one body, the expression of God through Christ, this body energised by his Spirit. We have both been reconciled to God through the same way, we both have peace with God through the same way, through the sacrificial Lamb of God (Jn 1:36) that was Christ. Christ has done everything necessary to create one body out of two peoples.