For the most part, when a politician takes their oath of office, they raise their right hand, place their left hand on the holy book of their choice, and swear to uphold the Constitution of the United States. Curiously, there's no constitutional requirement that an elected official take their oath of office on a holy book. In fact, John Quincy Adams allegedly took his oath of office on a book of laws, and Representative Kyrsten Sinema (D-AZ) the only member of Congress who lists her religion as "unaffiliated" took her oath on the Constitution.