we're making God's wisdom known

Ephesians 3:7-13

The mystery in this paragraph is explained in the previous paragraph: Gentiles and Jews are equal heirs through the good news of Jesus. Paul's specific role was to bring the Gentiles into the family of God by taking this good news message and revealing this mystery to the Gentiles.
If you were to ask me how God reveals his wisdom (before I read this passage) I would probably say something about through Jesus or through his divine providence, possibly through history or even through the Word. Never in a million years would I say that God reveals his manifold (I like that word!) wisdom to the rulers and authorities in the heavenly realms through the church. Paul is clear: the rulers and authorities look to the unity between Jew and Gentile in the Church to find evidence of God's wisdom. Wow! I still can't fathom it - that the rulers and authorities are struck by how wise God is when they look at the church. The next verse goes on to say that the unity between Jews and Gentiles in the Church was his eternal purpose which he accomplished in the work of Jesus Christ. This means that before time began, God determined that he would prove his wisdom to the angels and demons by bringing Jews and Gentiles together into one body.
So here's the question for me: am I helping to accomplish the eternal purpose of God? Am I helping my local expression of the Body of Christ to testify to God's wisdom or do I cause the spiritual realm to scoff at God's idea of unity? The point that is driven home to me is that the Church is God's idea, God's plan and reveals God's glory. I can either get on board in pointing to the glory of God by joining him in building his Church or I better get out of the way.