Existing research suggests a negative correlation between reflective thinking and religious belief. The dual process model (DPM) posits that reflection diminishes religious belief by limiting intuitive decisions. In contrast, the expressive rationality model (ERM) argues that reflection serves an identity-protective function by bolstering rather than modifying preexisting beliefs. Although the current literature tends to favor the DPM, many studies suffer from unbalanced samples. To avoid this limitation, we recruited comparably large number of participants for both religious believers (n = 580) and non-believers (n = 594) and observed the relationship between reflection and two measures of religious belief: belief in God and disbelief in evolution. Our findings corroborate the negative associations found between higher levels of reflection and both types of belief, independent of religious affiliation. Our results align with the broader literature, supporting the DPM but not the ERM.
