Prior investigations have suggested that offspring of religious intermarriages tend to adopt the religion of the mother. However, studies of religious identity and of the religious practices of these offspring are extremely rare. The present report focuses on both the religious identity and the church attendance of sons of Protestant-Catholic intermarriages. It is based on responses to questionnaires completed by a study population of army inductees at Fort Dix, New Jersey. Data are presented suggesting that the offspring of father-Protestant, mother-Catholic marriages are more likely to be Catholic than Protestant. However, the sons of father-Catholic, mother-Protestant marriages are almost equally divided into Protestants and Catholics. When paternal education is controlled, it appears that there are equal proportions of Protestant, Catholic, and unaffiliated respondents among offspring of college-educated men in the father-Protestant, mother-Catholic marriages. With regard to church-attendance practices, Catholic offspring of intermarriages report attending approximately as often as the men from homogeneous Catholic marriages. Protestant offspring of intermarriages present a mixed picture in church-attendance pattern. Educational level of the offspring is used in the explication of the analysis of church attendance data. Various related areas for further research are suggested.