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William Jennings Bryan and the Rise of Christian Fundamentalism in Early 20th Century America

How a three-time presidential candidate became the public face of a religious movement that reshaped American Christianity and politics.

By Garret Merkley · Explainer · Jun 8, 2026
Branched from The Scopes Monkey Trial: Faith, Science, and Public Education
Quick take
  • Bryan transformed from a populist politician into fundamentalism's most visible champion, using his oratory to defend literal biblical truth against modernism.
  • Fundamentalism emerged as a reaction to Darwinism, higher biblical criticism, and urban secularization—Bryan gave it a political and moral voice.
  • His 1925 prosecution in the Scopes trial became the symbolic climax of a broader cultural war over science, education, and religious authority in America.

William Jennings Bryan (1860–1925) was a three-time Democratic presidential candidate and Secretary of State who, in his final years, became American fundamentalism's most recognizable public figure. Fundamentalism itself was a Protestant movement that insisted on the literal truth of the Bible and rejected modern theological scholarship that treated scripture as a human document shaped by history and culture. Bryan didn't invent fundamentalism, but he gave it a platform, moral authority, and a crusade—one that culminated in his decision to prosecute a high school teacher in rural Tennessee for teaching evolution.

The Political Populist Becomes a Religious Warrior

Bryan's early career was defined by economic populism and anti-imperialism. He opposed monopolies, championed the gold standard debate ("Cross of Gold" speech, 1896), and fought corporate power. But by the 1900s, as Darwinism spread through universities and mainline Protestant denominations began adopting higher criticism—the scholarly method of treating the Bible as a historical text rather than divine dictation—Bryan saw a new enemy: the erosion of Christian faith itself. He came to believe that Darwinism undermined morality, that it justified ruthlessness in business and warfare, and that it stripped the Bible of its authority. His 1922 book *In His Image* explicitly attacked evolution as incompatible with Christian truth. Bryan reframed his populist fight against the powerful as a fight against intellectual elites who mocked rural, Bible-believing Christians.

What Fundamentalism Was and Why It Mattered

Fundamentalism emerged in the 1910s as an organized Protestant movement, crystallized around a series of pamphlets called *The Fundamentals* (1910–1915), which defended core doctrines: the verbal inspiration of the Bible, the virgin birth, the substitutionary atonement, the bodily resurrection of Christ, and the literal second coming. It was not anti-intellectual in origin—many early fundamentalists were educated clergy and scholars—but it was anti-modernist. Modernist Protestantism, dominant in seminaries and urban churches, treated the Bible as a source of spiritual wisdom shaped by ancient cultures, not as a scientific or historical document. Fundamentalism rejected this compromise.

Bryan's contribution was to make fundamentalism a mass movement and a political issue. He lectured constantly on the Chautauqua circuit, reaching thousands of small-town Americans who felt their faith and their way of life were under siege. He articulated a grievance that resonated: that secular intellectuals and urban elites were using schools and universities to indoctrinate children against the Bible and parental authority. He positioned fundamentalism not as obscurantism but as democratic—the majority of ordinary Christians defending their faith against arrogant specialists. This populist framing gave fundamentalism political legs.

The Campaign Against Evolution in Schools

In the early 1920s, Bryan launched a campaign to pass state laws banning the teaching of evolution in public schools. Tennessee, Oklahoma, and Florida passed such laws; others considered them. Bryan's argument was straightforward: taxpayers should not fund the teaching of doctrines that contradict the Bible and undermine Christian belief. He saw evolution not as a neutral scientific theory but as a worldview—a materialism that denied God's agency and human moral responsibility. When the American Civil Liberties Union arranged a test case in Dayton, Tennessee, Bryan volunteered to prosecute John Scopes, a high school biology teacher who had taught evolution in violation of state law. Bryan was 65 and in declining health, but he saw the trial as a final crusade.

Why This Moment Mattered

Bryan's rise as a fundamentalist leader reflected real anxieties in American Christianity. The 1920s were a period of rapid urbanization, immigration, and cultural change. Mainline Protestant denominations—Methodist, Presbyterian, Baptist—were splitting over modernism. Fundamentalists feared they were losing control of their churches and their children's education. Bryan gave voice to that fear and transformed it into a political movement. He also crystallized a lasting tension in American life: the question of what authority—religious tradition, scientific expertise, or democratic majority—should govern public education and cultural values. The Scopes trial, which Bryan technically won in court but lost in the press, became a symbolic defeat for fundamentalism in the eyes of urban intellectuals. But it also hardened fundamentalism's identity as a movement of the faithful standing against a hostile secular world—a posture that would define American evangelical and fundamentalist Christianity for the next century.

The Scopes Trial as Cultural Turning Point
  • Bryan died just days after the trial ended, cementing his image as a martyr to the cause.
  • Newspapers and magazines mocked Bryan's cross-examination on biblical literalism, turning the trial into a symbol of religious backwardness in the eyes of secular elites.
  • Yet the trial also energized fundamentalist networks, creating institutions (Bible colleges, publishing houses, radio ministries) that would sustain the movement for decades.
  • The trial did not settle the evolution question in schools—that battle continued through the 20th century and into the 21st.

Bryan's Legacy in American Fundamentalism

Bryan's role was to legitimize fundamentalism as a serious political and moral force, not a fringe sect. He showed that millions of Americans—rural, small-town, working-class, and some educated—shared a conviction that modern thought had severed itself from biblical truth and that this had moral and social consequences. He also modeled a particular style of fundamentalist activism: populist, anti-elite, focused on education and cultural institutions. After Bryan, fundamentalism became increasingly organized as a subculture with its own schools, publishing, radio stations, and eventually television networks. Fundamentalists largely withdrew from mainline denominations and built separate institutions. The alliance between fundamentalism and conservative politics, which would become dominant by the 1980s, was not yet explicit in Bryan's time, but he laid groundwork by framing the issue in terms of democratic majorities defending traditional values against arrogant intellectuals.

Was Bryan anti-science or just anti-evolution?
Bryan was not opposed to science per se, but he rejected Darwinian evolution as a materialist philosophy that denied God's creative role and moral authority. He believed science and the Bible could coexist if science stayed in its lane (explaining natural mechanisms) and didn't make claims about ultimate meaning or morality. This distinction—between science and scientism—remains common in fundamentalist thought today.
Did Bryan actually invent fundamentalism?
No. Fundamentalism as an organized movement emerged through *The Fundamentals* pamphlets and networks of conservative Protestant scholars and clergy in the 1910s. Bryan was a latecomer but became its most visible public advocate. He gave it a political voice and mass audience it might not otherwise have had.
Why did the Scopes trial hurt Bryan's cause if he won the case?
Bryan won legally but lost the narrative. Newspaper coverage, especially H.L. Mencken's dispatches, portrayed Bryan as ignorant and dogmatic when questioned about biblical literalism (e.g., the age of the earth, Jonah and the whale). Urban, educated readers saw the trial as proof that fundamentalism was anti-intellectual. This media defeat was more consequential than the legal victory.
How did Bryan's fundamentalism differ from earlier American evangelicalism?
Earlier evangelicalism (19th century) emphasized personal conversion and moral reform but coexisted with a range of theological views, including some acceptance of evolution as God's method. Fundamentalism was more combative and doctrinally rigid—it drew a line in the sand on biblical literalism and rejected compromise with modernism. Bryan helped make this harder stance the dominant form of conservative Protestantism.
Did Bryan's death end the fundamentalist movement?
Not at all. Bryan's death actually solidified his martyr status and energized fundamentalist institutions. The movement continued to grow through the mid-20th century, eventually merging with conservative evangelicalism and becoming a major force in American politics by the 1970s–80s.

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