questioning vs unbelieving

questioning

adj
  • Characterized by questions, inquisitiveness, doubt, or wonder. 

  • Unsure of one's sexual orientation and/or gender identity. 

noun
  • Interrogation. 

  • The action of asking questions; a survey; an inquiry. 

  • The act of challenging, wondering, and doubting. 

unbelieving

adj
  • That does not believe; incredulous, skeptical. 

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