conviction vs incredulity

conviction

noun
  • A judgement of guilt in a court of law. 

  • The state of being wholly convinced. 

  • A firmly held belief. 

  • The state of being found or proved guilty. 

incredulity

noun
  • Religious disbelief, lack of faith. 

  • Unwillingness or inability to believe; doubt about the truth or verisimilitude of something; disbelief. 

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