What we believe (Book of Concord 1580, Augsburg Confession 1530)
Article I: Of God.
1] Our Churches, with common consent, do teach that the decree of the Council of Nicaea concerning the Unity of the Divine Essence and concerning the Three Persons, is true and to be believed without any doubting; 2] that is to say, there is one Divine Essence which is called and which is God: eternal, without body, without parts, of infinite power, wisdom, and goodness, the Maker and Preserver of all things, visible and invisible; and 3] yet there are three Persons, of the same essence and power, who also are coeternal, the Father, the Son, and the Holy Ghost. And the term "person" 4] they use as the Fathers have used it, to signify, not a part or quality in another, but that which subsists of itself.
Article II: Of Original Sin.
1] Also they teach that since the fall of Adam all men begotten in the natural way are born with sin, that is, without the fear of God, without trust in God, and with 2] concupiscence; and that this disease, or vice of origin, is truly sin, even now condemning and bringing eternal death upon those not born again through Baptism and the Holy Ghost.
Article III: Of the Son of God.
1] Also they teach that the Word, that is, the Son of God, did assume the human nature in 2] the womb of the blessed Virgin Mary, so that there are two natures, the divine and the human, inseparably enjoined in one Person, one Christ, true God and true man, who was born of the Virgin Mary, truly suffered, was crucified, dead, and 3] buried, that He might reconcile the Father unto us, and be a sacrifice, not only for original guilt, but also for all actual sins of men.
Article IV: Of Justification.
1] Also they teach that men cannot be justified before God by their own strength, merits, or works, but are freely justified for 2] Christ's sake, through faith, when they believe that they are received into favor, and that their sins are forgiven for Christ's sake, who, by His death, has made satisfaction for our sins. 3] This faith God imputes for righteousness in His sight. Rom. 3 and 4…
…want to read more. See Book of Concord 1580.