Despite interest in the role of religiosity in youth development and health behavior, few studies have examined these associations in sexual minority youth. Participants (n = 11,699) who were adolescents (wave 1) and young adults (wave 3) in the Add Health survey were used to examine proximal and distal religiosity by sexual identity group and to test group differences in associations between religiosity and alcohol use. Sexual minorities were less likely than heterosexuals to report a current religious affiliation. In young adulthood, heterosexual females reported significantly higher distal and proximal religiosity than heterosexual males and sexual minority young adults. From adolescence to young adulthood, religiosity in all three sexual identity groups (heterosexual, bisexual, gay/lesbian) significantly declined, with the largest effects found for the sexual minority groups. Distal and proximal religiosity scores were significantly associated with less alcohol use and less binge drinking among heterosexuals, but not among sexual minorities. Future studies of sexual minority youth and their religious contexts are suggested.