This study draws together two research traditions: John Greer's pioneering research among pupils in Protestant and Catholic schools in Northern Ireland and Leslie J. Francis's research concerning teenage religion and values in England and Wales. A sample of 1,585 13- to 15-year-old male pupils attending Catholic schools (n = 712) and Protestant schools (n = 873) completed the Teenage Religion and Values Survey. The present analyses highlight the significant differences in world views between the Catholic and Protestant adolescents across eight domains defined as: religious beliefs, paranormal beliefs, church-related attitudes, attitudes toward sex and family life, law-related attitudes, school-related attitudes, locality-related attitudes, and personal anxiety and depression. These data confirm that in many key ways young people growing up in these two religious communities are still living worlds apart. (Contains 8 tables.)