materialist vs nonbelieving

materialist

adj
  • Having features typical of philosophical materialism. 

noun
  • Someone who is materialistic, concerned only with material possessions. 

  • A follower or proponent of philosophical materialism. 

nonbelieving

adj
  • Not a believer; in particular, not a member of a specific religious group 

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