Addressing the Lutheran Church Missouri Synod (LCMS) only and its view of the Pope and his authority. It is not a question of how much power he has, because for them he has none.
From the Doctrine of the LCMS (a series of Synodically Adopted Statements):
On Justification:
Quote:
19. We reject as apostasy from the Christian religion not only the doctrine of the Unitarians, who promise the grace of God to men on the basis of their moral efforts; not only the gross work-doctrine of the papists, who expressly teach that good works are necessary to obtain justification; but also the doctrine of the synergists, who indeed use the terminology of the Christian Church and say that man is justified "by faith," "by faith alone," but again mix human works into the article of justification by ascribing to man a co-operation with God in the kindling of faith and thus stray into papistic territory.
Of the Means of Grace:Quote:
23. We reject as a dangerous error the doctrine, which disrupted the Church of the Reformation, that the grace and the Spirit of God are communicated not through the external means ordained by Him, but by an immediate operation of grace. This erroneous doctrine bases the forgiveness of sins, or justification, upon a fictitious "infused grace," that is, upon a quality of man, and thus again establishes the work-doctrine of the papists.
The most openly confrontational and that clearly places the LCMS in absolute opposition to the Pope is this last one. (Emphasis added)
Of the Antichrist:Quote:
43. As to the Antichrist we teach that the prophecies of the Holy Scriptures concerning the Antichrist, 2 Thess. 2:3-12; 1 John 2:18, have been fulfilled in the Pope of Rome and his dominion. All the features of the Antichrist as drawn in these prophecies, including the most abominable and horrible ones, for example, that the Antichrist "as God sitteth in the temple of God," 2 Thess. 2:4; that he anathematizes the very heart of the Gospel of Christ, that is, the doctrine of the forgiveness of sins by grace alone, for Christ's sake alone, through faith alone, without any merit or worthiness in man (Rom. 3:20-28; Gal. 2:16); that he recognizes only those as members of the Christian Church who bow to his authority; and that, like a deluge, he had inundated the whole Church with his antichristian doctrines till God revealed him through the Reformation -- these very features are the outstanding characteristics of the Papacy. (Cf. Smalcald Articles, Triglot, p. 515, Paragraphs 39-41; p. 401, Paragraph 45; M. pp. 336, 258.) Hence we subscribe to the statement of our Confessions that the Pope is "the very Antichrist." (Smalcald Articles, Triglot, p. 475, Paragraph 10; M., p. 308.)
Sadly, they do not have the same view of Apostolic Succession of preaching and authority we have.