The rapid growth of emerging digital technologies is reshaping youth psychological well-being and religious identity in increasingly plural social contexts. This systematic review examines the impact of deepfakes, gaming, the metaverse, virtual reality, and chat applications on youth well-being, with particular attention to religion as both a protective factor and a target of digital harm. A PRISMA 2020–guided systematic review was conducted using Scopus, PubMed and Web of Science. Eligible studies were peer-reviewed articles published between 2000 and 2025, focused on youth aged approximately 10–24 years, and examined emerging digital technologies in relation to psychological well-being, identity development, bullying, or religiosity. Quantitative, qualitative, experimental, and intervention studies were included. Due to methodological heterogeneity, findings were synthesized thematically, and study quality was appraised narratively rather than through meta-analysis.