An unexpected fusion of two major western religious traditions, Judaism and Christianity, has been developing in many parts of the world. Contemporary Christian movements are not only adopting Jewish symbols and aesthetics but also promoting Jewish practices, rituals, and lifestyles. Becoming Jewish, Believing in Jesus is the first in-depth ethnography to investigate this growing worldwide religious tendency in the global South. Focusing on an austere 'Judaizing Evangelical' variant in Brazil, Carpenedo explores the surprising identification with Jews and Judaism by people with exclusively Charismatic Evangelical backgrounds. Drawing upon extensive fieldwork and socio-cultural analysis, the book analyses the historical, religious, and subjective reasons behind this growing trend in Charismatic Evangelicalism. The emergence of groups that simultaneously embrace Orthodox Jewish rituals and lifestyles and preserve Charismatic Evangelical religious symbols and practices raises serious questions about what it means to be 'Jewish' or 'Christian' in today's religious landscape. This case study reveals how religious, ethnic, and cultural markers are being mobilized in unpredictable ways within the Charismatic Evangelical movement in much of the global South. The book also considers broader questions regarding contemporary women's attraction to gender-traditional religions. This comprehensive account of how former Charismatic Evangelicals in Brazil are gradually becoming austerely observant 'Jews,' while continuing to believe in Jesus, represents a significant contribution to the study of religious conversion, cultural change, and debates about religious hybridization processes.