Support for Christian Zionism is declining among conservative evangelical Christians in the United States, particularly across the Bible Belt, following the war in Gaza. The movement, which holds that all Jews should immigrate to Palestine to trigger the return of Jesus Christ, has tens of millions of followers concentrated in the southeast and south-central regions of the U.S.

The war in Gaza, in which more than 72,000 Palestinians, including 38,000 women and children, have been killed, has coincided with a decline in American public support for Israel and a divide within the evangelical base. A 2011 survey by the National Association of Evangelicals found that 65 percent of evangelicals across all ages believed in premillennialism — the belief that Jesus Christ will return to earth to rule for 1,000 years before the end of times. In a separate 2021 survey of evangelicals under 30, 33.6 percent of respondents said they supported Israel, while 21 percent said they believed in premillennialism.

Motti Inbari and Kirill Bumin hypothesized that diminishing belief in premillennialism contributed to changing attitudes among young evangelicals. Premillennialism holds that several prophecies linked to the restoration of biblical Israel must be fulfilled for the return of Christ to occur, that modern-day Israel needs to be supported in an existential battle against regional adversaries, and that it should be assisted in building the Third Temple on the site of Al Aqsa Mosque in occupied Jerusalem. Pew Research polls show a drop in support for Israel among young conservatives and Christians in general, and an IMEU poll shows a growing perception among young Republicans that Israel has too much influence in U.S. politics.

The shifting attitudes have not yet had a tangible impact on the power of Christian Zionism, according to experts. "Today, [Christian Zionism] may be becoming less universally popular, but less popular does not mean less powerful," said Reverend Fares Abraham, a Palestinian-American Christian pastor and author. "It is highly organised, well-funded, and closely allied with secular and Jewish Zionist groups. That alliance gives it structural durability," he said.

The Israel Allies Foundation identified Israel's top 50 Christian allies over the past five years, including mega-churches, religious broadcasters, charities, and NGOs. Public financial information was available for 36 of those organizations, with combined annual revenues totaling $2.8 billion. The Christians United for Israel lobby arm spent more than $670,000 on lobbying in Washington to strengthen sanctions on Iran and has worked to secure billions in funding for Israel.