credulity vs skepticism

credulity

noun
  • Faith, credence; acceptance or maintenance of a belief. 

  • A willingness to believe in someone or something in the absence of reasonable proof; credulousness. 

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 credulity and skepticism occurred in a corpus of books? (source: Google Ngram Viewer )