Require that federal officeholders swear their oaths on a copy of the U.S. Constitution, instead of a religious document

Despite the "Seperation of church and state" that is supposedly one of the founding principles of representative democracy, multiple religious documents, including the Bible, Koran, and various other holy books are increasingly included during the administrations of oaths to public officials. While I understand and respect the symbolism and power that these manuscripts impart upon the officeholder, I believe that such usage is in direct violation of the establishment clause. Therefore, I submit that all elected federal officials swear-in on a copy of the United States Constitution, promoting both our country's rich political history, and it's even greater political future.