communion vs unbelief

communion

noun
  • A form of ecclesiastical unity between the Roman Church and another, so that the latter is considered part of the former. 

  • A joining together of minds or spirits; a mental connection. 

  • Holy Communion. 

unbelief

noun
  • An absence (or rejection) of belief, especially religious belief 

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