That is why Paul mentioned that the Antichrist is in the temple of God, pretending he is God, claiming salvation is through him (the Antichrist" alone), that "the mysteries of iniquity" were "already at work" in the church in his day and will continue until the end of time. John also mentioned that the Antichrist "sits on the seven hills."
Rome hasn't changed its teaching against justification by faith. Most Lutherans haven't either.
So Bachmann's former Lutheran church, as well as several other conservative churches, see a biblical basis for seeing the papacy as the Antichrist. Yet, as the article points out, such churches do not deny that a person can be saved in the Catholic church, or even that any individual pope could not be saved.