belief vs infidelity

belief

noun
  • Mental acceptance of a claim as true. 

  • Religious faith. 

  • One's religious or moral convictions. 

  • The quality or state of believing. 

  • Faith or trust in the reality of something; often based upon one's own reasoning, trust in a claim, desire of actuality, and/or evidence considered. 

  • Something believed. 

infidelity

noun
  • Unfaithfulness in some other moral obligation. 

  • Lack of religious belief. 

  • Unfaithfulness in a marriage or an intimate relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse. 

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