The church is not the kingdom of God. Though not entirely separate, the church and the kingdom of God are not the same, and must not be confused. Since Jesus is Lord of both, believers (members of the church) do belong to the kingdom.
And when they had appointed elders for them in every church, with prayer and fasting they committed them to the Lord in whom they...
“And to the angel of the church in Philadelphia write: 'The words of the holy one, the true one, who has the key of...
... so that, with the eyes of your heart enlightened, you may know what is the hope to which he has called you, what...