affiliation vs theology

affiliation

noun
  • The establishment of a child's paternity or maternity 

  • The relationship resulting from affiliating one thing with another. 

  • A club, society or umbrella organisation so formed, especially a trade union. 

theology

noun
  • Subjective marginal details. 

  • Synonym of religious studies 

  • 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. 

  • A particular belief within a religion. 

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