From my meetings with Mormons it seems that the thing that almost seems to excite them the most is the authority of the LDS Church and its Priesthoods. This is their solution to doctrinal confusion because, coupled with the warm fuzzy feeling they understand to be the witness of the Holy Spirit, they can know that a teaching is true because it comes from the LDS church.
Galatians has a different perspective on authority...
Paul recognises that the truth of the gospel he preaches depends on it coming from God.
- He is an "apostle - not from men nor through man, but through Jesus Christ and God the Father" (1:1)
- He says: "I did not receive it from any man, nor was I taught it, but I received it through a revelation of Jesus Christ" (1:12)
- He spent years in the wilderness (metaphorically and literally at times) before coming to see the Apostles (2:1)
- Who these Apostles were "makes no difference" to Paul and they added nothing to his message (2:6)
Authority is not something inherent to any person other than God, but belongs to someone so long as he preaches the Gospel.
- His authority can be questioned if he preaches a different Gospel (1:8, and implied in 2:18)
- Peter's authority can be questioned on the same basis (2:14)
- Even angels should be questioned if they preach a different Gospel (1:8)
Paul's authority is paralleled in the authority of any Christian.
- Paul was "called by [God's] grace" to preach, and had Christ revealed to him so that he could preach him to the Gentiles (1:15-16)
- The whole Galatian church were "called [by God] in the grace of Christ" (1:6) when "Jesus Christ was publicly portrayed as crucified" to them (3:1)
The Gospel is equated by Paul with God the Father, Jesus Christ, and his crucifixion.
- Paul equates the Gospel with God the Father (1:6; 3:6)
- Jesus Christ (1:12; 1:16; 2:16; 5:2)
- Jesus' death (3:1; 6:14)
- Blessing of the Gentiles in Abraham/Christ (3:8; cf. 5:6)
- NB the revelation of Jesus Christ, the crucified and risen One, included within it the calling of Paul to the Gentiles and knowing God as Father. These are not separate revelations or callings
The truth of the Gospel he preaches is shown in the effect it has - i.e. that it delivers the goods.
- By hearing it the Galatians received the Holy Spirit (3:2)
- The Spirit cries "Abba! Father!" (4:6)
- The Spirit (presumably) is what supplies a feeling of blessing that means a great desire to serve and give gifts to the person who shared it with you whatever the cost (4:15)
- The Spirit has fruit of "love, joy peace, patience, kindness, goodness, faithfulness, gentleness, self-control" (although note this is a imperative (walk by the Spirit), that comes from the indicative (we live by the Spirit, 5:25)
- After all, if the Gospel is Jesus Christ then if it is being preached the Holy Spirit, who indwells the Son, will be with it.
God gives the Gospel, which is himself, to Christians who have authority in their re-presenting of the Gospel. The Gospel is both their possession and their master, just as God is given to us and yet we serve him. As soon as the Gospel is something we control we lose the possession of it, and so as soon as the preaching authority of the church is exercised outside of obedience to God we lose the authority.
To be joined to Christ by faith in him is to share his authority. To preach Christ is to exercise that authority. True authority never belongs to us or is exercised by us except dependent on Christ's personal authority. Not just in an initial gift, but continually. Christ must be the alpha and omega of our authority to teach.
I think Mormons believe Christ is the alpha, but not the omega, of the authority of their church.

