nonbeliever

/ˌnɑnbɪˈlivər/
noun
  1. A person who does not believe in a particular religion or religious doctrine.
    • The debate between a believer and a nonbeliever was respectful and thoughtful.
    • The church welcomed both believers and nonbelievers to the community event.
    • As a nonbeliever, she respected her friends' religious traditions without sharing them.
  2. A person who does not accept or trust a particular idea, claim, or system.
    • He was a nonbeliever in the new diet trend until he saw the results.
    • The team's early success turned many nonbelievers into supporters.
    • She remained a nonbeliever in the conspiracy theory despite the online rumors.
Antonyms
What does "nonbeliever" mean? | whatsthatwordmean | whatsthatwordmean