traditionalism

Short definition from Wiktionary

Noun

1. 1
   The adherence to traditional views or practices, especially with regard to cultural or religious matters.
2. 2
   The continuation of theological rituals on the basis that the ritual has always completed, rather than the ritual being a manifestation of theology.
3. 3
   A philosophical system which makes tradition the supreme criterion and rule of certitude; the doctrine that human reason is of itself radically unable to know with certainty any truth or, at least, the fundamental truths of the metaphysical, moral, and religious order.