Heathen vs perfidious

Heathen

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

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

perfidious

adj
  • Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. 

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