Sharia banks are financial institutions that are operationally different from conventional banks. People understand conventional banks better than Sharia banks. This research aims to determine the influence of knowledge, perception, promotion and community religiosity on interest in becoming Sharia bank customers in the people of Purwokerto City, Banyu as Regency. This research uses a quantitative method by determining the sample using a simple random sampling technique with a total of 400 respondents. The data for this research is regarded as primary data. The data collection method was carried out using a questionnaire. The data was analyzed using multiple linear regression analysis. This research variable consists of independent variables which include knowledge, perception, promotion and religiosity, as well as a dependent variable regarding people's interest in becoming Sharia bank customers. Partially, the variables knowledge, perception, promotion and religiosity have a significant positive effect on people's interest in becoming Sharia bank customers. Then simultaneously the variables of knowledge, perception, promotion and religiosity influence the interest of the people of Purwokerto City to become Sharia bank customers.