The research aims to achieve the objectives of analyzing the extent of the influence of religiosity towards decision making to be a customer of Bank Riau Kepri Sharia, Indonesia. This reseach used explanatory quantitative, intended to explain the relationship among variables to examine a hypothesis. The population of this study is all customers of Bank Riau Kepri Sharia in year 2021. A total samples are 205 respondents, to determine the sample using multivariate analysis Jhon Hair. In order to answer the problems formulated in this study using Structural Equation Modeling (SEM) is conducted. Based on the discussion and analysis, the result reveals conclusion that religiosity has influence towards decision making to be a customer of Bank Riau Kepri Sharia, which means that increasing the religiosity influence the decision to be a customer of Bank Riau Kepri Sharia. The transformation of conventional consumer behavior theory, Kotler -Armtrong to be Islamic consumer behavior.