The BEST response by far to this question is from an open letter signed by RC Sproul and others about the dangerous heresies of Kristian Zionists
knoxseminary.org/Prospective/Faculty/WittenbergDoor/
""The Gospel offers eternal life in heaven to Jews and Gentiles alike as a free gift in Jesus Christ.3 Eternal life in heaven is not earned or deserved, nor is it based upon ethnic descent or natural birth.4
All human beings, Jews and Gentiles alike, are sinners,5 and, as such, they are under God’s judgment of death.6 Because God’s standard is perfect obedience and all are sinners, it is impossible for anyone to gain temporal peace or eternal life by his own efforts. Moreover, apart from Christ, there is no special divine favor upon any member of any ethnic group; nor, apart from Christ, is there any divine promise of an earthly land or a heavenly inheritance to anyone, whether Jew or Gentile.7 To teach or imply otherwise is nothing less than to compromise the Gospel itself.
God, the Creator of all mankind, is merciful and takes no pleasure in punishing sinners.8 Yet God is also holy and just and must punish sin.9 Therefore, to satisfy both his justice and his mercy, God has appointed one way of salvation for all, whether Jew or Gentile, in Jesus Christ alone.10
Jesus Christ, who is fully God and fully man,11 came into the world to save sinners.12 In his death upon the cross, Jesus was the Lamb of God taking away the sin of the world, of Jew and of Gentile alike. The death of Jesus forever fulfilled and eternally ended the sacrifices of the Jewish temple.13 All who would worship God, whether Jew or Gentile, must now come to him in spirit and truth through Jesus Christ alone. The worship of God is no longer identified with any specific earthly sanctuary. He receives worship only through Jesus Christ, the eternal and heavenly Temple.14
To as many as receive and rest upon Christ alone through faith alone, to Jews and Gentiles alike, God gives eternal life in his heavenly inheritance.15
The inheritance promises that God gave to Abraham were made effective through Christ, Abraham’s True Seed.16 These promises were not and cannot be made effective through sinful man’s keeping of God’s law.17 Rather, the promise of an inheritance is made to those only who have faith in Jesus, the True Heir of Abraham. All spiritual benefits are derived from Jesus, and apart from him there is no participation in the promises.18 Since Jesus Christ is the Mediator of the Abrahamic Covenant, all who bless him and his people will be blessed of God, and all who curse him and his people will be cursed of God.19 These promises do not apply to any particular ethnic group,20 but to the church of Jesus Christ, the true Israel.21 The people of God, whether the church of Israel in the wilderness in the Old Testament22 or the Israel of God among the Gentile Galatians in the New Testament,23 are one body who through Jesus will receive the promise of the heavenly city, the everlasting Zion.24 This heavenly inheritance has been the expectation of the people of God in all ages.25
Jesus taught that his resurrection was the raising of the True Temple of Israel.26 He has replaced the priesthood, sacrifices, and sanctuary of Israel by fulfilling them in his own glorious priestly ministry and by offering, once and for all, his sacrifice for the world, that is, for both Jew and Gentile.27 Believers from all nations are now being built up through him into this Third Temple,28 the church that Jesus promised to build.29
Simon Peter spoke of the Second Coming of the Lord Jesus in conjunction with the final judgment and the punishment of sinners.30 Instructively, this same Simon Peter, the Apostle to the Circumcision,31 says nothing about the restoration of the kingdom to Israel in the land of Palestine.32 Instead, as his readers contemplate the promise of Jesus’ Second Coming, he fixes their hope upon the new heavens and the new earth, in which righteousness dwells.33
The entitlement of any one ethnic or religious group to territory in the Middle East called the “Holy Land” cannot be supported by Scripture. In fact, the land promises specific to Israel in the Old Testament were fulfilled under Joshua.34 The New Testament speaks clearly and prophetically about the destruction of the second temple in A.D. 70.35 No New Testament writer foresees a regathering of ethnic Israel in the land, as did the prophets of the Old Testament after the destruction of the first temple in 586 B.C.36 Moreover, the land promises of the Old Covenant are consistently and deliberately expanded in the New Testament to show the universal dominion of Jesus,37 who reigns from heaven upon the throne of David, inviting all the nations through the Gospel of Grace to partake of his universal and everlasting dominion.38
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