In an era when the Republican Party is increasingly defined by Christian nationalism, few know of Robert Green Ingersoll, a prominent 19th-century GOP figure who boldly championed agnosticism across the nation—including in Kentucky.

According to reporting from the Kentucky Lantern, Ingersoll was a superstar in the last quarter of the 19th century, delivering passionate speeches promoting freethought to thousands of Americans. Dubbed "The Great Agnostic," Ingersoll argued that "Religion can never reform mankind because religion is slavery."

Ingersoll proved fearless in bringing his message to the Bible Belt. He spoke to Kentucky crowds 17 times—14 times in Louisville, twice in Lexington, and once in Paris, presenting lectures on topics like "Mistakes of Moses" and "Hell" to packed auditoriums. When he appeared at Louisville's Opera House in November 1878, the staunchly Democratic Courier-Journal conceded that "the Opera-house last night was packed from the orchestra railing to the furthermost seat in the gallery."

Most remarkably, Ingersoll remained a respected and even beloved party member unto his death despite his unorthodox views. The son of an abolitionist minister, he backed federal activism in support of Black civil rights, supported women's suffrage, and advocated for an eight-hour workday for laborers. He also championed evolution, opposed capital punishment, and denounced nativism—positions that would make him a pariah in today's GOP.

The Illinois Attorney General and prominent Republican campaign orator never held elected office higher than state attorney general, as his refusal to hide his agnosticism deterred higher advancement. Yet as the leading political speechmaker for his party, he became seen and heard by more Americans than any other human until the advent of radio and motion pictures.

Ingersoll died in 1899 at age 65 and was buried in Arlington National Cemetery. His passing left behind a legacy sharply at odds with the party he championed—one where questioning religion was not merely tolerated, but by a significant segment of the Republican establishment, actively welcomed.