dogma

noun

• An authoritative principle, belief or statement of opinion, especially one considered to be absolutely true and indisputable, regardless of evidence or without evidence to support it.
• A doctrine (or set of doctrines) relating to matters such as morality and faith, set forth authoritatively by a religious organization or leader.

  "In the Catholic Church, new dogmas can only be declared by the pope after the extremely rare procedure ex cathedra to make them part of the official faith."