Heathen vs atheistic

Heathen

adj

  • Pertaining or adhering to the Germanic neo-pagan faith Heathenry. 

noun

  • An adherent of the Germanic neo-pagan faith of Heathenry. 

atheistic

adj

  • of or relating to atheists or atheism 

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