ABSTRACT
Nonbelief is the general term for such attitudes as atheism, agnosticism, and apatheism, all of which means the absence of religious or spiritual beliefs; the absence of belief in supernatural beings or God/gods; and the non-acceptance of any reality beyond matter. Most of the research in this field shows that more than 70% of nonbelievers are deconverted from belief to nonbelief. The majority of answers given to the question of how believers become nonbelievers over time involve intellectual development. In this study, 502 believers and nonbelievers, participated in the survey, and 32 nonbelievers were interviewed. Findings show that social and emotional factors have priority over intellectual factors in terms of being a nonbeliever. Those who became nonbelievers due to social factors tried to justify their nonbelief rationally, whereas nonbelievers tended to give intellectual factors.