theism vs unbelief

theism

noun
  • Belief in the existence of at least one deity. 

  • Belief in the existence of a personal creator god, goddess, gods and/or goddesses present and active in the governance and organization of the world and the universe. The God may be known by or through revelation. 

  • A morbid condition resulting from excessive consumption of tea. 

unbelief

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

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