The church of Christ belongs to Jesus Christ.
He created His church and only His church. He recognizes no other and says any other will be uprooted by the Father. Ephesians 4:4-6 clearly says:
"There is one body and one Spirit, just as also you were called in one hope of your calling; 5 one Lord, one faith, one baptism, 6 one God and Father of all who is over all and through all and in all. " Now read Colossians 1:18,
"He is also head of the body, the church... NASU.
Christ is only coming back for His church
1 Corinthians 15:20-24
20 But now Christ has been raised from the dead, the first fruits of those who are asleep. 21 For since by a man came death, by a man also came the resurrection of the dead. 22 For as in Adam all die, so also in Christ
all will be made alive. 23 But each in his own order: Christ the first fruits,
after that those who are Christ's at His coming, 24 then comes the end,
when He hands over the kingdom (church/body) to the God and Father,
when He has abolished all rule and all authority and power.