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Identity is built in the context of an individual’s professed values, moral principles, and often, religiosity. Adolescence and emerging and early adulthood are times of intensive identity construction and of changes in religious attitudes. Therefore, the aim of this study was to characterise people across these three developmental periods in terms of the level of their identity and religiosity, and to examine whether particular identity styles allow for the prediction of the overall level of religiosity. For this purpose, the whole sample of N = 1017 individuals and particularly from adolescence (n = 307), emerging adulthood (n = 410), and early adulthood (n = 302) were studied. The results showed a lower level of the informational style and a higher level of the diffuse-avoidant style in adolescence as compared with the two older groups, who did not differ from each other. The overall level of religiosity did not significantly differentiate the developmental groups; however, it was explained by identity formation styles in different ways at particular developmental stages. Results of moderation analyses suggest that the informational style has positive effect only in adolescence; the normative style has positive effects in each age group but is strongest in early adulthood, and the diffuse-avoidant style presents negative effect in adolescence.