Faith alone justifies whether one belongs to a true church or a church where false doctrine is tolerated. You make the same error as the Papists in associating visible church membership with invisible church membership. Is that due to your doctrine of covenant?

There are only a few Lutheran churches scattered throughout the world who remain faithful to the Augsburg Confession. Most have signed an agreement with the AntiChrist that denies the doctrine of justification by faith alone.

My denomination, LCMS, is now officially heterodox because it tolerates the introduction of idolatry into worship by one of its ministers. However, there are "loyal soldiers" within the LCMS. These churches and individuals have signed statements of confessional protest. They have broken off fellowship with the main body according to 2 Thes. 3:14, 15. They expect persecution.