Abstract
Drawing upon data from the NJPS 2000-1, we argue that traditional approaches to t k study of religious mobility - both apostasy and switching - are increasingly problematic. Apostasy from ethno-religious communities, in particular, must be refomulated to incorporate an ethnic dimension. Analyses using this revised concept of "ethno-apostasy" led to results that at times diverge from those of previous research. The findings suggest that the premise that religious switching is a binary change from one mutually incompatible state to another must be reconceptualized to account for declining support in American society for the assumption that a person can hold only one religious afiliation at a time.