Ephesians 2:15 note 8
158 The church is not only the church of God, the Body of Christ (the fullness, the expression, of the all-filling One—1:23), and the household or family, the house, the temple, and the dwelling place of God (2:19, 21-22); it is also the one new man, which is corporate and universal, created of two peoples, the Jews and the Gentiles, and composed of all the believers, who, though they are many, are one new man in the universe.
God created man as a collective entity (Gen. 1:26). The corporate man created by God was damaged through man's fall; hence, there was the need for God to produce a new man. This was accomplished through Christ's abolishing in His flesh the ordinances and through His creating of the new man in Himself.