Amen, mm. This is the point of Eph. 3:10. That we, who know the grace of God are studied by angels. They are indeed learning through us, the Church the Body of Christ. :)
So, if there is a Church who claims to be teaching the angels, and that Church does not teach the salvation by grace through faith in the FINISHED WORK OF CHRIST, obviously that Church cannot possibly be teaching the angels. Grace is the whole point of EVERYTHING. Without grace, the rest is just works. And this is what God is showing the angels through the Church the Body of Christ, His matchless grace. "That in the ages to come he might shew the exceeding riches of his GRACE in his kindness TOWARD US through Jesus Christ." Eph. 2:7.