When you receive the Holy Spirit,then the kingdom of God is within you,so the kingdom of God coming to earth is by the people receiving the Spirit,and representing the ways of God on earth like Jesus.
28But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you(Matthew 12:28).
Jesus is signifying that when a person is led of the Spirit and doing the will of God,then the kingdom of God is there,for they are representing the kingdom of God.
The kingdom of God comes without observation,because it is not a governmental establishment enforcing God's ways,but the kingdom of God is displayed by the saints as they are led of the Spirit showing God's ways on earth,and the Bible says the saints have no country as of yet,but are strangers passing through the land,seeking a better country.
Any nation,government,that claims Christianity as it's religion,and people who reject it in that nation,or have different beliefs,are punished by that nation,tortured,or imprisoned,is not doing the will of God,for while we have to come to God to be saved,for God commands it,a nation,government,cannot make you obey it,and certainly cannot punish you for not following God,in the truth,or the truth they believe,because Jesus said be harmless as doves,and if they do not listen to what you say,then wipe the dust off your feet and turn around and leave,and in no circumstance are we to hurt them.
1And he said unto them, Verily I say unto you, That there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power(Mark:9:1).
21Peter seeing him saith to Jesus, Lord, and what shall this man do? 22Jesus saith unto him, If I will that he tarry till I come, what is that to thee? follow thou me(John 21:21-22).
Some people think when the Bible says the kingdom of God will come that it is referring to 2000 years later,the millennial reign of Christ,but Jesus said there were some disciples standing there,that shall not die,until they see the kingdom of God come with power,and some say,how can this be,can they live for 2000 years when the kingdom of God comes,the millennial reign of Christ.
But when you receive the Spirit the kingdom of God is within you.
1And when the day of Pentecost was fully come, they were all with one accord in one place.
2And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
3And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
4And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance(Acts 2:1-4).
On the day of Pentecost,the kingdom of God had come with power,as the Holy Spirit was then available to receive by people,and Peter preached that added people to the Church,and the miracles that accompanied the people that received the Spirit,as Jesus said miracles and wonders will follow those who are saints,which also testify that God is in them of a truth.