The argument typically goes like this:
In Genesis 15:18, God makes a covenant with Abram (Abraham), saying, "To your descendants I give this land, from the river of Egypt to the great river, the Euphrates."
This is interpreted as an eternal, unconditional, and literal deed of land to the Jewish people.
Therefore, any modern Jewish claim to the land of Israel/Palestine is a direct fulfillment of this divine promise, and Christians are obligated to support it.
From a traditional Christian hermeneutic (method of interpretation), reading Genesis 15 this way makes several key errors:
A. The Promise is Christologically Fulfilled, Not Politically
The central tenet of Christianity is that Jesus Christ is the ultimate fulfillment of God's covenants and promises in the Old Testament.
The "Seed" is Christ: In the New Testament, Paul explicitly addresses the promise to Abraham's "seed" (singular, not plural). He argues in Galatians 3:16 that the "seed" refers not to many descendants but to one person: "The promises were spoken to Abraham and to his seed. Scripture does not say 'and to seeds,' meaning many people, but 'and to your seed,' meaning one person, who is Christ."
The Land is a Shadow of a Greater Reality: Christian theology has historically seen the Promised Land as a type or foreshadowing of a greater spiritual reality: the Kingdom of God, eternal rest, and reconciliation with God through Christ. The writer of Hebrews argues that the earthly Canaan was never the true goal; the patriarchs were longing for a "heavenly country" (Hebrews 11:13-16).
The Covenant is Expanded: The New Testament teaches that through faith in Christ, Gentiles are grafted into the promises made to Abraham. The true "Israel of God" (Galatians 6:16) is not defined by ethnic descent or national borders but by faith in the Messiah. The inheritance is no longer a specific plot of land but the entire world (Romans 4:13) and ultimately, eternal life.
In short: From a Christian view, the ultimate descendant of Abraham is Jesus, and the ultimate promised land is the Kingdom of God established through Him. To insist on a literal, political fulfillment is to ignore the New Testament's own interpretation of these Old Testament promises.
B. The Conditional Nature of the Land Promise
While the Abrahamic covenant itself is based on God's grace, the continued possession of the land in the Old Testament was consistently tied to Israel's faithfulness to the Mosaic Covenant (the Law).
Deuteronomy and the Exile: The entire book of Deuteronomy is a series of warnings that obedience leads to blessing and life in the land, while disobedience leads to curses and exile. This is exactly what happened with the Assyrian and Babylonian exiles. The land promise was always conditional on covenant faithfulness.
The New Covenant in Christ: Christianity holds that Jesus established a New Covenant (Jeremiah 31:31-34, Luke 22:20), which transcends and fulfills the old ones. The focus shifts entirely from a national, territorial identity to a global, spiritual people of God.
C. Misapplication of Old Testament Narratives to Modern Geopolitics
Applying a 4,000-year-old divine promise made in a specific ancient context directly to a 20th/21st-century nationalist movement is a profound hermeneutical leap.
Context Matters: Genesis 15 was about God giving a nomadic chieftain a promise concerning the Canaanite tribes of the Bronze Age. It was not a divine mandate for 21st-century settlement projects or the displacement of existing populations.
Ignoring New Testament Ethics: A strict Christian Zionist reading often sidelines the core ethical teachings of Jesus, such as the Sermon on the Mount, which calls for peacemaking, mercy, and love of neighbor and enemy (Matthew 5). Prioritizing a political claim to land over the well-being and justice for all people living on that land (both Israelis and Palestinians) is a direct conflict with Christian ethics.
D. The Danger of Replacement Theology (A Note of Caution)
It is important to distinguish this critique from the error of "Replacement Theology" (or Supersessionism), which teaches that the Church has completely replaced Israel in God's plans and that God has no future for ethnic Jewish people. This view has historically been used to justify anti-Semitism.
Many Christians who reject Christian Zionism still hold to a belief that God has a future plan for national Israel (based on readings of Romans 9-11). However, they argue this will be a spiritual salvation through faith in Christ at the end of the age, not a political entitlement in the present age that overrides the rights of others.
A Christian theology that seeks to be faithful to the whole Bible would argue:
The Promise was Ultimately Spiritual: The land covenant in Genesis 15 finds its true and final fulfillment in Jesus Christ and the global, multi-ethnic Kingdom of God he inaugurated.
The People of God are Redefined: The primary heirs of Abraham's promise are those who have faith in Christ, whether Jew or Gentile (Galatians 3:7-9, 28-29).
Justice and Love are Paramount: In the present age, the Christian's duty is not to advocate for a specific political outcome based on a contested interpretation of ancient prophecy, but to pray and work for peace, justice, security, and human dignity for all people in the region—Israelis and Palestinians alike.
The Hope is Eschatological: The final resolution of who possesses the land is God's business at the final judgment, not a matter for modern political lobbying. Our hope is in the new creation, not in the shifting borders of nation-states.
Therefore, to claim that Genesis 15 requires Christians to support a specific modern political movement is to ignore the central message of the New Testament and the person of Jesus Christ, to whom the Old Testament ultimately points.