Emerging adulthood is an important period for managing the pressing developmental tasks of identity exploration and formation. Affiliation with a religion can inform how emerging adults understand themselves and commit to aspects of their identity, which may have implications for well-being. The present studies tested the ways in which identification with and commitment to Christianity inform identity development (i.e., exploration and commitment) and well-being (i.e., positive affect, negative affect, life satisfaction) among two samples of central U.S. college adults, both concurrently (Studies 1 and 2) and with a 2-month follow-up (Study 2 only). Across studies, self-identification as a Christian and greater commitment to Christianity were positively associated with identity exploration and subjective well-being. Further, indirect effects were supported between Christian affiliation and well-being, given differences in identity exploration. The current studies motivate a continued focus on social identities as contributors to adjustment in emerging adulthood.