The short answer is that the Ekklesia (called church in most Bibles) is not the Kingdom.
The two differ in at least eight points.
- The Church (Ekklesia) is heir of the Kingdom.
The Church (Ekklesia) has no heirs.
- The Church is the receiver of the Kingdom.
The Church has no receiver.
- There are elders in the Church.
The are no elders in the Kingdom.
- The Bible speaks of “sons of the Kingdom”.
There are no “sons of the Church”.
- The Church is called a temple (Ephesians 2:21).
The Kingdom is never called a temple.
- The Church is present here on earth before the Rapture.
The Kingdom is not present here on on earth for the King is not present (Matthew 6:10).
- The Church was never the subject of any prophecy – it is a “mystery”, not revealed before Pentecost (Ephesians 3:5, 9).
The Kingdom is the one subject of prophecy.
- The Church is to be built up (Ephesians 4:12).
The Kingdom is to be set up (Acts 15:16).
- The Church is the Bride, the Lamb’s Wife.
The Lamb and the Bride rule the Kingdom.