Knowing the doctrinal difference between the terms "Kingdom of Heaven" and "Kingdom of God" is the key to understanding the complete time line of Biblical history past, present, and future, the proper place of the Church, and the prophetic future of Israel. The Bible is about the struggle for a Kingdom; the Kingdom of Heaven, a Kingdom with its Capital City (Jerusalem) on this Earth. This is one of the most hated and least understood doctrines of the Bible, yet one of the most important in rightly dividing the truth; the separation of Church doctrine from Tribulation doctrine. *Some churches do not want to hear this, because they think that the Church has replaced Israel. Certainly the whole world reviles at the prospect of hated Israel becoming the head of the Kingdoms. There is a hatred of Christians and Jews on a spiritual level that is beyond their own comprehension. Satan hates the Jews, and the world is under Satan's control. Hate and envy are the root reasons the word "now" is removed from John 18:36 in some translations. The world does not want the Lord Jesus Christ to return and rule over them. That is why the Jews killed their King the first time He came. Because the Lord used the terms "Kingdom of Heaven" and "Kingdom of God" interchangeably in places in the four Gospels, most Christians think they are one and the same. They will be, but not until the Second Coming of the Lord Jesus Christ when He rules the world for a thousand years on the throne of His father David (His father in the flesh, His human side) at Jerusalem. If you rightly divide the Bible, you will see that Jesus was preaching about two (2) components of the Kingdom. He preached that the political kingdom (Kingdom of Heaven) was coming, and if the Jews had accepted Him after His death and resurrection, He would have come back and established it after seven years of tribulation, as foretold in the prophecies. Israel rejected their King when He came the first time. In the almost two millenniums since then His Kingdom has been in a MYSTERY form; the Lord Jesus Christ reigning in the heart of the believer, and yet seated on the right hand of the Father in the third heaven. And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation: Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you [when you receive Christ as Savior]. Luke 17:20-21 The Kingdom of Heaven will be established upon the earth at the end of the Tribulation and extend for 1,000 years. Jesus will be Priest and King in Jerusalem. The Kingdom of Heaven will be brought to the earth, and Satan will be bound. The whole earth will be filled with the knowledge of the Lord.