The Great American Conflict, a 75-minute documentary produced by a Texas-based organization dedicated to converting Iran to Christianity, declares its goal right at the beginning: “to reveal the true Islam to all people, especially in the West,” Iran Alive Ministries’s founder Hormoz Shariat says. “This film is also meant to be a warning to America. There is a serious threat of Islam in our nation.”Released at the start of summer and having premiered at a gathering of the Dallas County Republican Party, it’s an obscure film — you’ve probably never heard of it — but it has so far had...