The body of Christ is not spiritual Israel. Spiritual Israel is spiritual Israel.Israel is the Church when again we look at and consider the redemption promise made to Israel Ps 130:7-8
7 Let Israel hope in the Lord: for with the Lord there is mercy, and with him is plenteous redemption.
8 And he shall redeem Israel from all his iniquities.
The Promise is that the Lord shall redeem Israel from all his iniquities. Now this is fulfilled in the church Titus 2:14
14 Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
Titus is written to the Church, the Elect of God Titus 1:1
Paul, a servant of God, and an apostle of Jesus Christ, according to the faith of God's elect, and the acknowledging of the truth which is after godliness;
Its the same people, the Church, and Israel being redeemed from all iniquity ! No not ethnic national israel, they were a type, a shadow, but Spiritual Israel, Christs and Abrahams Spiritual seed.
The body of Christ is a new creature.