Though the Gentiles will have opportunity for redemption, the nation of Israel will still retain distinct privileges and status. The barrier between Jew and Gentile will not fall. Notice carefully what is and what is not said in this passage. Both Jew and Gentile have access to the Father by the same Spirit. Gentiles are no more strangers and foreigners.
Gentiles are fellow citizens with the saints.
Gentiles are members of the household of God. While a quick reading of this passage might seem to suggest that believing Gentiles have become part of national Israel, a careful study will reveal this is not the case. If the passage concerns the nation of Israel, it should not be interpreted as referring to the church. If it refers to the church, it should not be interpreted as referring to the nation of Israel. Obviously, if it refers to the heathen nations, it should be interpreted neither as having to do with the nation of Israel nor the church.