IMO, this is the #1 mistake of the dispensationalist.
Christ is King TODAY on this earth and in heaven. The resurrection proved that fact to all those with eyes to see.
And he is before all things, and by him all things consist." -- Colossians 1:16-17"For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
Christ is King over ALL THINGS.
I give thee charge in the sight of God, who quickeneth all things, and before Christ Jesus, who before Pontius Pilate witnessed a good confession; That thou keep this commandment without spot, unrebukable, until the appearing of our Lord Jesus Christ: Which in his times he shall shew, who is the blessed and only Potentate, the King of kings, and Lord of lords; Who only hath immortality, dwelling in the light which no man can approach unto; whom no man hath seen, nor can see: to whom be honour and power everlasting. Amen." -- 1 Timothy 6:12-16"Fight the good fight of faith, lay hold on eternal life, whereunto thou art also called, and hast professed a good profession before many witnesses.
Those are our marching orders. Jesus Christ is King of Kings and Lord of Lords TODAY, "on earth as it is in heaven," now and always.
To ignore that fact simply hands over God's creation to those who deny Him.
2 Corinthians 4:4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
The phrase “god of this world” (or “god of this age” [NKJV]) indicates that Satan is the major influence on the mind-set expressed by the ideals, opinions, goals, hopes and views of the majority of people. His areas of influence also encompass the world’s philosophies, education, and commerce. The thoughts, ideas, speculations and false religions of the world are under his control and have sprung from his lies and deceptions.
Similar titles are found elsewhere in Scripture concerning Satan. Satan is called the "prince of the power of the air" in Ephesians 2:2. He is called the "ruler of this world" in John 12:31. These titles, and many more attributed to Satan throughout Scripture, signify his capabilities. To say, for example, that Satan is the "prince of the power of the air" is to signify that in some way he rules over the world and the people in it.
This is not to say that he rules the world completely; only God does this. But it does mean that God, in His infinite wisdom, has allowed Satan to operate in this world (within the boundaries God has set for him) and has allowed Satan to operate with an agenda. When the Bible says Satan has power over the world, it must be made clear that God has given him domain over unbelievers alone. Believers are no longer under the rule of Satan (Colossians 1:13). Unbelievers, on the other hand, are caught "in the snare of the devil" (2 Timothy 2:26), lie in the "power of the evil one" (1 John 5:19), and are in bondage to Satan (Ephesians 2:2).
So, when the Bible says that Satan is the "god of this world," it is not saying that he has ultimate authority. It is conveying the idea that Satan rules over the unbelieving world in a specific way. In the case of 2 Corinthians 4:4, the unbeliever follows Satan's agenda. According to 2 Corinthians 4:4, the "god of this world has blinded the minds of unbelievers, so that they cannot see the light of the gospel of the glory of Christ." Satan's agenda includes pushing a false philosophy onto the unbelieving world—a false philosophy that blinds the unbeliever from the truth of the Gospel. Satan’s philosophies are the fortresses in which people are imprisoned, needing to be set free and brought captive to Christ in obedience to the truth.