The Coming of the Kingdom of God

John the Baptist and the Lord Jesus preached the coming of the Kingdom of God to the earth. I do not know when it happened, but somehow the Gospel of the Kingdom was changed into the Gospel of Heaven. Instead of the Good News being that the Kingdom was coming to the earth, the Good News now is that we will go to Heaven when we die or when we are "raptured."
Why was the Gospel changed? Probably to be more in line with the other religions of the earth, which teach that if we obey the tenets of the religion we will go to some sort of paradise when we die.
There is an invisible Kingdom of God. It is the rule of God in Christ in whomever Christ is dwelling.
There is a visible Kingdom of God. The visible Kingdom of God is the rule of Christ over all people living on the earth when He returns with His saints.
The Christian Church is the government of the Kingdom of God.
When the visible Christian Church comes down through the new sky to be installed on a high mountain of the new earth, it will govern the nations of people who have been saved to citizenship on the new earth.