 Psychologists and sociologists of religion also began to doubt that religious beliefs were rooted in irrationality, psychopathology, and other atypical psychological states, as James (1902) and other early psychologists had assumed. In the US, in the late 1930s through the 1960s, psychologists developed a renewed interest for religion, fueled by the observation that religion refused to decline and seemed to undergo a substantial revival, thus casting doubt on the secularization thesis (see Stark 1999 for an overview). Psychologists of religion have made increasingly fine-grained distinctions between types of religiosity, including extrinsic religiosity (being religious as means to an end, for instance, getting the benefits of being a member of a social group) and intrinsic religiosity (people who adhere to religions for the sake of their teachings) (Allport &amp; Ross 1967). Psychologists and sociologists now commonly study religiosity as an independent variable, with an impact on, for instance, health, criminality, sexuality, socio-economic profile, and social networks.