The author analyzes the characteristics of participants in a Taiwanese religious movement that emerged in the mid-1980s: Nona-Huatsang Tantric Buddhism, Data were collected via interviews with 92 randomly selected believers, and the method of Qualitative Comparative Analysis was applied, The main findings are: a) in terms of demographics, most of the interviewees joined the group at the age of 26 to 35 (born between 1961 and 1970), approximately one-half have college degrees, and about one-third are the children of fathers born in mainland China; b) assimilation among ethnic groups facilitated religious changes in mainlanders - that is, members of the second generation of mainland migrants reported that they were influenced by mothers of Minnan or Hakka descent in terms of religious activity; and c) religious changes among Minnan and Hakka believers have been strongly affected by the rapid urbanization of Taiwan.