Now I know where you are coming from. You believe "The Kingdom of God" is merely a spiritual kingdom?
I used to believe this too until I did some further reading and study of the scriptures and discovered that "The Kingdom is both spiritual AND territorial. Here are some of the things I discovered......
First, what does prophesy say...
(Daniel 2:44-KJV) "And in the days of these kings shall the God of heaven set up a kingdom, which shall never be destroyed: and the kingdom shall not be left to other people, [but] it shall break in pieces and consume all these kingdoms, and it shall stand for ever."
(Revelation 11:15) "And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become [the kingdoms] of our Lord, and of his Christ; and he shall reign for ever and ever."
Now let's look at two common misunderstood passages....
(Luke 17:21) "Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is WITHIN YOU." Now I can see why people who read this on the surface and do not look into the original Greek word used here, would think that the Kingdom is in our hearts or spiritual. But that's not what Jesus said here.
The Greek word used for "within" is "endiusko" which means "to cloth with a garment". But the "root" references for this word takes you back to "en" which means "among, in place, time or state" and "duo" which means to "go down" or "set before".
So was Jesus really saying the kingdom of God is "set before you" or "among you" right now? In other words, the kingdom is here because the KING is here before you.
(John 18:36) "Jesus answered, My kingdom is not of this WORLD."(Greek word for world is "cosmos" which means "world order or arrangement of things"): Then Jesus says, "if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence." The word "hence" in Greek is "enteuthen" which means "on either side" or if you trace the root words even further you find that root word "en" again. Another of the many meaning of this root is "in place, time or state." (Jesus was saying His world order was not in place yet, because if it was then His servants would be fighting for him. Because at that time, his purpose was not to fight, but to die and be resurrected.)
Now, let's examine some more passages....
(Mat thew 5:5) "Blessed [are] the meek: for they shall INHERIT THE EARTH."
(Mat thew 6:10) "Thy kingdom come. Thy will be done IN EARTH, as [it is] in heaven."
The word "earth" is the Greek word "ge" pronounced "ghay", which means "soil, region, the whole globe, country, land or world."
If you think this is a "figure of speech" or metaphorical, then ask yourself, have the "meek" inherited the earth right now? Are the meek in control? I would say not. It's not happened yet.
Then, Jesus was speaking to the Pharisees, (Matthew 21:43) "Therefore say I unto you, The kingdom of God shall be taken from you, and given to A NATION bringing forth the fruits thereof." (Who is this nation? Why did Jesus use the Greek word "ethnos" for "nation"? Ethnos means: a people, non-Jewish tribe, Gentile, or race. So Jesus was clearly referring to something physical here, not spiritual.)
(Matthew 25:34) "Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:"
(Act s1:6) "When they therefore were come together, they (his disciples) asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?"
Jesus' ascension(Acts 1:11) "Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven."
When Jesus wanted us to understand something that was "spiritual" he told us it was "spiritual", when he wanted us to know he was speaking of something "earthly, he told us.
For example: (John 3:12) Jesus says, " If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you [of] heavenly things?"