irreligious vs sinful

irreligious

adj
  • Contrary to religious beliefs and practices. 

  • In conscious rejection of religion. 

  • Having no relation to religion. 

sinful

adj
  • Constituting a sin; morally or religiously wrong; wicked; evil 

  • Having sinned; guilty of sin. 

  • decadent (luxuriously self-indulgent) 

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