Heathen vs polytheistic

Heathen

adj

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

noun

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

polytheistic

adj

  • Of or relating to polytheism, 

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