While “Barbie” and “Oppenheimer” have hogged the headlines, an unlikelier blockbuster swept the box office this month: “Sound of Freedom,” a thriller lauded by QAnon conspiracy theorists and high-profile Republicans. It also draws from a conspiratorial well that includes a number of anti-Jewish canards, including the “blood libel” accusation, while its star, actor Jim Cavaziel, has floated antisemitic theories in interviews promoting the film. Despite the film’s low budget and independent distributor, “Sound of Freedom” has made over $100 million in its first few weeks, going toe-to-toe with “Indiana Jones and the Dial of Destiny” since it opened on July...