nontheism vs sectarianism

nontheism

noun
  • Any of a range of concepts regarding spirituality and religion which do not include the idea of a deity in the form of a theistic god or gods. 

sectarianism

noun
  • Rigid adherence to a particular sect, denomination, ideology, or party. 

  • A political system in which power is shared among religious sects based on a constitutional formula distributing public offices among these sects 

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