To me, I don't care which "organization" claim the "rights" to be connected as part of "true Church". We are to focus on spiritual matters in the invisible church rather than temporal matters of the visible Church. We who love Jesus Christ constitute the true church. We belong to the collective Body of Christ whether we're alive or in glory. The Greek word for church is ekklesia, which means "an assembly of called-out ones. " The church is made up of people called by God to be His children. We have become united with all other believers by faith in Christ, who said, "I will build my church, and the gates of hell shall not prevail against it" (Matt. 16:18). Jesus meant He would gather together a body of believers. He wasn't talking about organizations; He was talking about people. We who know and love Him are the living church that has been born into the family of God by the Holy Spirit. As members of "the general assembly and church of the first-born, who are written in heaven" (Heb. 12:23), we have been declared righteous because our sin has been washed away by the blood of Jesus Christ (Rev. 1:5). Only Pride will say "We are the true Church". While Humility will say "I am a member of the One, Holy, Catholic and Apostolic Church" by looking at unity, holiness, universality, and apostolicity.
One thing that irritates me that those focus on the superficial and temporal church more than spiritual church. The Holy Spirit gave me assurance of my faith and doctrines I follow. No Church, No Denomination, No pastors or anyone can do this for me. Holy Spirit is the ONLY person who can do this. 2 Timothy 2:19 Nevertheless, God's solid foundation stands firm, sealed with this inscription: "The Lord knows those who are his," and, "Everyone who confesses the name of the Lord must turn away from wickedness." Truth is, the Holy Spirit that can grasp our inner being only when we submit completely which will allow the Holy Spirit teach us, lead us mysterious and divine where we ought to go. "Teach me your way, O LORD, and I will walk in your truth; give me an undivided heart, that I may fear your name." Psalm 86:11. The Holy Spirit that leads my thoughts and shapes my character. Our true moral and spiritual state is revealed by the Spirit through prayer and studying the Word. Eternally, we are "eternal (spiritual) members" in the universal church of Jesus Christ, based solely on His merit and grace. If we are a Christ-follower, then we are already a member. This is eternal and unchanging (I Corinthians 12:12-13; Ephesians 2:13-22; 4:3-6; Colossians 1:13-22). Everyone who is saved is a member of God's Kingdom.