Our churches subscribe to the Lutheran Confessions precisely because we wish to maintain a clear articulation of the Gospel. Listen to this beautiful gem from Bente:
In our Confessions (FC SD, V, 20) we read:
The Gospel, however, is that doctrine which teaches what a man should believe in order to obtain the forgiveness of sins from God, since man has failed to keep the law of God and has transgressed it, his corrupted nature, thoughts, words, and deeds war against the law, and he is therefore subject to the wrath of God, to death, to temporal miseries, and to the punishment of hell-fire. The content of the Gospel is this, that the Son of God, Christ our Lord, himself assumed and bore the curse of the law and expiated and paid for all our sins, that through him alone we reenter the good graces of God, obtain forgiveness of sins through faith, are freed from death and all the punishments of sin, and are saved eternally.
This statement may well be considered one of the most important and formative statements in our Lutheran Confessions. Why? Because it is the most complete and beautiful definition of the Gospel to be found in them. And that is what our Confessions are all about-the Gospel! Our great Lutheran Confessions were written for the sake of the Gospel. The Augsburg Confession, Luther's catechisms, the Formula of Concord were not written just to blast or correct abuses in the Roman Church, or to defend Lutheran theology against the attacks of papists, or to perpetuate party spirit. These Confessions were all prompted by a faith in the Gospel, a love for it, and a determination to teach and confess it according to the Scriptures.
-Triglotta, "The Confessions and the Gospel"