profession vs theology

profession

noun
  • The declaration of belief in the principles of a religion; hence, one's faith or religion. 

  • The practitioners of such an occupation collectively. 

  • A promise or vow made on entering a religious order. 

  • Any declaration of belief, faith or one's opinion, whether genuine or (as now often implied) pretended. 

  • An occupation, trade, craft, or activity in which one has a professed expertise in a particular area; a job, especially one requiring a high level of skill or training. 

theology

noun
  • A particular belief within a religion. 

  • Synonym of religious studies 

  • Subjective marginal details. 

  • An organized method of interpreting spiritual works and beliefs into practical form. 

  • The study of God, a god, or gods; and of the truthfulness of religion in general. 

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