The Orange Catholic (or O.C.) Bible is the primary religious text in the Dune universe. It combines traditional religions such as Mahayana Christianity and Buddhislam. Its primary teachings are a result of what is called the "Butlerian Jihad", or the crusade against thinking machines such as robots. The two primary commandments are :
"Thou shalt not disfigure the soul."
"Thou shalt not make a machine in the likeness of a human mind."
The O.C. Bible illustrates many of the technophobic sentiments that would lead to humans themselves developing analytical abilities, like the Mentats and the Bene Gesserit. Frank Herbert borrowed a lot of his quotations from the Christian Bible, referencing the books of Genesis, Psalms, Ecclesiastes,etc. He also references the Koran, including excerpts from many of its suras, or chapters. Dr. Yueh references the Surat Al-Anbiya when he says
"From water does all life begin" ( Al-Anbiya 30)