Supernatural agents are critical components of all religions but not of all ideologies. They are, in part, by-products of a naturally selected cognitive mechanism for detecting agents-such as predators, protectors, and prey-and for dealing rapidly and economically with stimulus situations involving people and animals. This innate releasing mechanism is trip-wired to attribute agency to virtually any action that mimics the stimulus conditions of natural agents: faces on clouds, voices in the wind, shadow figures, the intentions of cars or computers, and so on. Among natural agents, predators such as snakes are as likely to be candidates for deification as are protectors, such as parent-figures.

Introduction: an evolutionary riddle, p. 15 - In Gods We Trust: The Evolutionary Landscape of Religion (2002)