agnostic vs disbelieving

agnostic

adj
  • Of or relating to agnosticism or its adherents. 

  • Doubtful or uncertain about the existence or demonstrability of God or other deity. 

  • Of a software component etc.: unaware or noncommittal regarding the specific nature of the components or input with which it interacts. 

  • Having no firmly held opinions on an issue or matter of uncertainty. 

noun
  • A person who holds to a form of agnosticism, especially uncertainty of the existence of a deity. 

disbelieving

adj
  • refusing to believe; skeptical or incredulous 

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