My study through Ephesians leads me one simple conclusion. This is a conclusion reached by James Jordan long before N.T. Wright ever came into the scene. Ephesians teaches that the gospel is much greater than individual salvation or forgiveness (though this is strongly included in Ephesians), but the mystery of the gospel is as Peter Leithart summarizes:
The mystery of the gospel, God’s secret now openly told in the gospel, has to do with the union of all things in heaven and earth in Christ; it has to do with the union of the heavenly people (Jews) and the earthly people (Gentiles) into one new man who stretches between heaven and earth.