unbeliever

/ˌʌnbɪˈlivər/
noun
  1. A person who does not believe in a particular religion or religious doctrine.
    • The missionary spoke to a crowd of unbelievers about his faith.
    • She was raised in a religious household but became an unbeliever as an adult.
    • In medieval times, unbelievers were often treated with suspicion.
  2. A person who doubts or does not accept something that others believe to be true.
    • He was an unbeliever when it came to the benefits of meditation until he tried it himself.
    • The scientist was an unbeliever in the conspiracy theory, demanding proof.
    • Despite the evidence, the unbelievers refused to accept the climate change report.
Antonyms
What does "unbeliever" mean? | whatsthatwordmean | whatsthatwordmean