disbelief vs religion

disbelief

noun
  • Astonishment. 

  • Unpreparedness, unwillingness, or inability to believe that something is the case. 

  • The loss or abandonment of a belief; cessation of belief. 

religion

noun
  • Rituals and actions associated with religious beliefs, but considered apart from them. 

  • Any practice to which someone or some group is seriously devoted. 

  • Belief in a spiritual or metaphysical reality (often including at least one deity), accompanied by practices or rituals pertaining to the belief. 

  • A particular system of such belief, and the rituals and practices proper to it. 

  • The way of life committed to by monks and nuns. 

verb
  • Engage in religious practice. 

  • To make sacred or symbolic; sanctify. 

  • Indoctrinate into a specific religion. 

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