nontheism vs tergiversation

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. 

tergiversation

noun
  • The act of abandoning something or someone, of changing sides; desertion; betrayal. 

  • The act of evading any clear course of action or speech, of being deliberately ambiguous; equivocation; fickleness. 

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