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The Mickey Mouse problem refers to the difficulty in predicting which supernatural agents are capable of eliciting belief and religious devotion. We approached the problem directly by asking participants to invent a “religious” or a “fictional” agent with five supernatural abilities. Compared to fictional agents, religious agents were ascribed a higher proportion of abilities that violated folk psychology or that were ambiguous–violating nonspecific or multiple domains of folk knowledge–and fewer abilities that violated folk physics and biology. Similarly, participants rated folk psychology violations provided by the experimenter as more characteristic of religious agents than were violations of folk physics or folk biology, while fictional agents showed no clear pattern. Religious agents were also judged as more potentially beneficial, and more ambivalent (i.e., similar ratings of benefit and harm), than fictional agents, regardless of whether the agents were invented or well-known to participants. Together, the results support a motivational account of religious belief formation that is facilitated by these biases.

Cognitive scientists have attributed the ubiquity of religious narratives partly to the favored recall of minimally counterintuitive (MCI) concepts within those narratives. Yet, this memory bias is inconsistent, sometimes absent, and without a functional rationale. Here, we asked if MCI concepts are more fitness relevant than intuitive concepts, and if fitness relevance can explain the existence and variability of the observed memory bias. In three studies, participants rated the potential threat and potential opportunity (i.e., fitness relevance) afforded by agents with abilities that violated folk psychology, physics, or biology (i.e., MCI abilities). As in previous work, agents with MCI abilities were recalled better than those with intuitive abilities. Additionally, agents with MCI abilities were perceived as greater threats, and as providing greater opportunities, than agents with intuitive abilities, but this perceived fitness relevance only mediated the memory bias when MCI abilities were used to accomplish disproportionally consequential outcomes. Minimally counterintuitive abilities that violated folk psychology were rated more intuitive and more of an opportunity than violations of folk physics or biology, while folk physics violations were recalled best. Explanations for these effects and their relevance to the cognitive science of religion are discussed.