Harvey,
Perhaps this will help alleviate your confusion.
"IV. The Sacrament of Holy Baptism
As the head of the family should teach it in a simple way to his household.
First.
What is Baptism?--Answer.
Baptism is not simple water only, but it is the water comprehended in God's command and connected with God's Word.
Which is that word of God?--Answer.
Christ, our Lord, says in the last chapter of Matthew: Go ye into all the world and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost."
http://bookofconcord.org/smallcatechism.php#baptismAlso:
"What makes a Sacrament?
What precisely makes a rite an authentic Sacrament? That is, what must be there for us to acknowledge the presence of a valid Sacrament? A common and accurate answer found among us is “God’s word and the element(s).” There is seldom debate on what elements are meant, so no discussion on that point is included at this time. (3) But what exactly is meant by the “word of God” that is here linked to the element? While this may seem like a silly question, it is one that must be asked with seriousness and answered with accuracy. Our understanding of the “word of God” that is joined to the water, bread, and wine will determine if and when we consider an ecclesiastical action a true Sacrament.
What is the Word of God?
The first observation that our Lutheran fathers have repeatedly made is that God’s word is not simply to be equated with the sounds and syllables drawn from the biblical text. Rather, the word of God is essentially the divine truths or thoughts conveyed to us through human speech or language. Robert Preus comments on the distinction between these aspects of Scripture:
'According to Lutheran theology, the
materia of Scripture is the letters, syllables, words, and phrases that together constitute Scripture. . . . The
forma of Scripture is its inspired meaning, the thoughts of God concerning our salvation and divine mysteries, . . . thoughts that God revealed to us in time and communicated to us in Sacred Scripture. Considered according to its
materia, Scripture is the Word of God only in a secondary and inappropriate sense, inasmuch as it is only the vehicle that brings the thoughts of God to us. It is the
forma of Scripture, the inspired meaning, that makes Scripture what it is—the Word of God—and distinguishes it from all other books. The dogmaticians, therefore, when they speak of Scripture as the Word of God, are thinking primarily of the divine intention and meaning, the inspired content, of Scripture. (4)'
This distinction between the
forma (essence) and
materia (external form) of Scripture is important to keep in mind while asking what is joined to the elements to create Sacraments. (5) The outward forms and sounds of the Bible text, including the grammatical constructions (
materia Scripturae) are to serve as vehicles for the divine truth, the sense and thought God is communicating to us (
forma Scripturae). When that does not happen we may have correct-sounding words, even biblical words and phrases, that nevertheless are empty of God’s word. Illustrative examples of this would be references to “Our Father in heaven” when used in the setting of a false fraternal organization, the use of the divine name “Jehovah” when used at a Kingdom Hall of the Jehovah’s Witnesses, or the use of the Trinitarian formula among the Mormons or Unitarians. In these instances, while the outward form and vocabulary of Scripture may be used and clearly recognizable, the meaning and sense is utterly foreign to Scripture and is for that reason no longer God’s Word.
The application of this principle to the matter of discerning the presence of a valid Sacrament is perhaps obvious. Any religious group that denies the deity of Christ and the doctrine of the Holy Trinity does not have Christian Baptism even if they should apply water “in the name of the Father and of the Son and of the Holy Spirit.” The correct vocabulary and sounds are all there, but the definitions attached to those words and the consistently maintained meaning of the phrase is simply not what God has communicated in Scripture. The essential word of God is absent, is not joined to the element, and so no valid Sacrament exists. "
(3)Questions and debate about the Sacramental elements are a part of church history. The question of whether liquids other than water are permissible in Baptism has been asked. Regarding the Lord’s Supper, of course, questions have more frequently been asked, e.g., whether leavened or unleavened bread should be used or whether grape wine should be used to the exclusion of grape juice or wines made from other fruits or plants. Our limited time and purpose prohibit us from including these issues in this paper. Let it suffice to say we acknowledge bread (with or without yeast) and “fruit of the grape vine” (normally fermented but not absolutely excluding unfermented) as the proper elements for the Lord’s Supper.
(4) Robert Preus, The Theology of Post-Reformation Lutheranism, I, p.267.
(5) While beyond our point of discussion here, we must also remember that in some ways the
forma and
materia of Scripture cannot be separated. Both are equally inspired when the reference is to the external form of the Hebrew and Greek Scriptures." [emphasis added]
"The Sacraments: Who Exactly Has Them—And What Exactly Do They Have?
by Forrest L. Bivens
http://www.wlsessays.net/bitstream/handle/123456789/525/BivensSacraments.pdf?sequence=1&isAllowed=y