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Do you understand what you are reading here?

Yes, the Augsburg Confession teaches that God works faith through the means of grace as opposed to Warfield's statement that man conveys means of grace. It's easy to see where sacerdotalism is being taught.

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A BRIEF AND UNTECHNICAL STATEMENT OF THE REFORMED FAITH...
I believe that God has established his Church in the world and endowed it with the ministry of the Word and the holy ordinances of Baptism, the Lord's Supper and Prayer; in order that through these as means, the riches of his grace in the gospel may be made known to the world, and, by the blessing of Christ and the working of his Spirit in them that by faith receive them, the benefits of redemption may be communicated to his people; wherefore also it is required of me that I attend on these means of grace with diligence, preparation, and prayer, so that through them I may be instructed and strengthened in faith, and in holiness of life and in love; and that I use my best endeavors to carry this gospel and convey these means of grace to the whole world.