heathen vs kafir

heathen

noun
  • A person who does not follow a Christian religion; a pagan. 

  • An uncultured or uncivilized person, philistine. 

adj
  • Uncultured; uncivilized; savage, philistine. 

  • Not adhering to the Christian religion (though usually excluding the Jews); pagan. 

kafir

noun
  • A disbeliever, a denier: someone who rejects or disbelieves in God as per Islam (Arabic: الله Allāh) or the tenets of Islam; or more broadly any non-Muslim. 

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