nonbeliever

non be liev er |ˌnänbəˈlēvər ˌnɑnbəˈlivər | ▶noun a person who does not believe in something, esp. one who has no religious faith.

nonbeliever

nonbeliever noun her family condemned her for marrying a nonbeliever: unbeliever, disbeliever, skeptic, doubter, doubting Thomas, cynic, nihilist; atheist, agnostic, freethinker; infidel, pagan, heathen.