doctrine vs skepticism

doctrine

noun
  • A self-imposed policy governing some aspect of a country's foreign relations, especially regarding what sort of behavior it will or will not tolerate from other countries. 

  • A belief or tenet, especially about philosophical or theological matters. 

  • The body of teachings of an ideology, most often a religion, or of an ideological or religious leader, organization, group, or text. 

skepticism

noun
  • Doubt or disbelief of religious doctrines 

  • The practice or philosophy of being a skeptic. 

  • The doctrine that absolute knowledge is not possible 

  • A studied attitude of questioning and doubt 

  • A methodology that starts from a neutral standpoint and aims to acquire certainty though scientific or logical observation. 

How often have the words doctrine and skepticism occurred in a corpus of books? (source: Google Ngram Viewer )