Jesus uses the term church and kingdom interchangably in MATTHEW 16:18-19. Jesus gave the KEYS TO THE KINGDOM to Peter ! Read MATTHEW 16:18-19, don't cherry pick words to suit your own beliefs. Jesus' Kingdom is also here on earth not just in heaven. His life, death and resurrection is pointless if his kingdom was not established on earth, the kingdom of God is a victory on earth thru the Blood of Jesus Christ.
Luke 11:20 "But if I cast out demons by the finger of God, then the kingdom of God has come upon you.
St. Mark announces to us the beginning of the public life of our Lord in these words: “And after John was delivered up, Jesus came into Galilee, preaching the gospel of the kingdom of God and saying: ‘The time is completed, and the kingdom of God is at hand: repent, and believe in the gospel’” (Mk 1:14).
St. Matthew says somewhat more briefly: “From that time Jesus began to preach and to say: ‘Do penance, for the kingdom of heaven is at hand’” (Mt 4:17).
St. Matthew sums up the whole of our Lord’s teaching in the words: “preaching the gospel of the kingdom” (Mt 4:23), and our Lord himself, according to St. Luke, describes this as the object of his mission: “To other cities also I must preach the kingdom of God: for I am sent for this purpose” (Lk 4:43).
Psalm 47:7-8 For God is the King of all the earth; Sing praises with a skillful psalm. God reigns over the nations, God sits on His holy throne.
1 Chronicles 28:5 "Of all my sons (for the LORD has given me many sons), He has chosen my son Solomon to sit on the throne of the kingdom of the LORD over Israel.
Acts 28:23 When they had set a day for Paul, they came to him at his lodging in large numbers; and he was explaining to them by solemnly testifying about the kingdom of God and trying to persuade them concerning Jesus, from both the Law of Moses and from the Prophets, from morning until evening.
Matthew 11:12 "From the days of John the Baptist until now the kingdom of heaven suffers violence, and violent men take it by force.
Matthew 3:1-2 Now in those days John the Baptist came, preaching in the wilderness of Judea, saying, "Repent, for the kingdom of heaven is at hand."
Matthew 13:31-32 He presented another parable to them, saying, "The kingdom of heaven is like a mustard seed, which a man took and sowed in his field; and this is smaller than all other seeds, but when it is full grown, it is larger than the garden plants and becomes a tree, so that THE BIRDS OF THE AIR come and NEST IN ITS BRANCHES."
Mark 4:30-32 And He said, "How shall we picture the kingdom of God, or by what parable shall we present it? "It is like a mustard seed, which, when sown upon the soil, though it is smaller than all the seeds that are upon the soil, yet when it is sown, it grows up and becomes larger than all the garden plants and forms large branches; so that THE BIRDS OF THE AIR can NEST UNDER ITS SHADE."
Luke 13:18-19 So He was saying, "What is the kingdom of God like, and to what shall I compare it? "It is like a mustard seed, which a man took and threw into his own garden; and it grew and became a tree, and THE BIRDS OF THE AIR NESTED IN ITS BRANCHES."
Matthew 13:33 He spoke another parable to them, "The kingdom of heaven is like leaven, which a woman took and hid in three pecks of flour until it was all leavened."
Luke 13:20-21 And again He said, "To what shall I compare the kingdom of God? "It is like leaven, which a woman took and hid in three pecks of flour until it was all leavened."
Matthew 16:28 "Truly I say to you, there are some of those who are standing here who will not taste death until they see the Son of Man coming in His kingdom."
Mark 9:1 And Jesus was saying to them, "Truly I say to you, there are some of those who are standing here who will not taste death until they see the kingdom of God after it has come with power."
- The word Ekklesia is transliterated to a broader term not just from its literal meaning, just like the word bible, baptism, catholic etc, if we follow your poor translation, then everything would be inconsistent.