Extant article utilizes the UTAUT Model with Islamic religiosity as a moderator to understand the adoption of SADAD payment system by Saudi banking customers. Islamic religiosity effects the behavior and choices of people. Path analysis performed on 248 respondents' data collected through questionnaires tests the conceptual hypotheses. All hypotheses except H3 was unsupported, which reveals that social influence (SI) had an insignificant relation with behavioral intention (BI). Multi-group analysis was performed on AMOS by dividing respondents into two groups with high and low Islamic religiosity values. Overall, results reveal that religiosity moderates the positive effect of BI on usage behavior (UB). The author found no effect for those with low scores on religiosity values. However, consumers with high score religiosity values have a stronger positive effect between BI and UB. Moreover, the UTAUT + IR explained 80% variance in UB. High religiosity customers find SADAD a better option.