Yes, God will reject Christians who support the Jewish nation of Israel, because the Gospels of Jesus Christ in the New Testament is very clear about God’s condemnation of Israel as a nation that rejects Jesus Christ and kills God’s prophets who are sent.
Christians who support the secular Jewish nation of Israel are standing against the Gospels of Jesus Christ in the New Testament. It is important for such Christians to repent and turn away from their wrong ways. It is important not to be blindly loyal to human ideology of Dispensationalism with the result that you stand against the Gospel of Jesus Christ in the New Testament. Dispensationalism is human ideology. The Holy Bible is the living Word of God!
Matthew 23:38 is clear in prophesying that God will destroy Jerusalem (the capital of Israel) for killing God’s prophets. This is the Word of God for the People of God (that is, Christians), and all Christians must submit and kneel before the Word of God, the Holy Bible.
Those Christians who continue to support the Jewish nation of Israel against the Gospels of Jesus Christ are, in essence, rejecting the Gospels of Jesus Christ and are standing against the Holy God of the Bible.
God will punish those Christians, their families, and their children for rebellion against the Holy Trinity and the Kingdom of Christ in the form of natural Acts of God (Hurricanes, Tornados, Earthquakes, etc.) and God’s punishment by human agents (such as when God blessed the Roman destruction of Jerusalem in 70 AD in fulfillment of Matthew 23:38 prophecy against the Jewish nation that killed Jesus Christ (according to the Gospels and the New Testament).
Choose whom you will serve! God or the Christ-killing Jewish state of Israel.
God will retaliate against every Christian who stands with the secular nation of Israel in defiance of the Word of God which calls for the destruction of Jerusalem for killing God’s prophets.