Antonyms of noun theism

1 sense of theism

Sense 1
theism -- (the doctrine or belief in the existence of a God or gods)
       Antonym of atheism (Sense 1)
      => atheism, godlessness -- (the doctrine or belief that there is no God)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun theism

1 sense of theism

Sense 1
theism -- (the doctrine or belief in the existence of a God or gods)
       => religion, faith, religious belief -- (a strong belief in a supernatural power or powers that control human destiny; "he lost his faith but not his morality")