Abstract: Sharia bank enters a new phase in 1974. Countries which joined in the Organization of Islamic Cooperation founded the financial institutions that provide financial services based on fees and profit sharing to the Organization of Islamic Cooperation member countries. The Sharia banking in Indonesia is started in 1991 by a Muamalat Indonesia bank. The development of the market share until 2012 has reached about 4.62%, it means that Sharia banking must try hard to develop its market share. But the market share of Sharia banking always loses with the conventional banks, it can only grow 1% per year but the conventional banks can grow till 7% per year. The marketing mix is the product, the price, distribution and promotion of the location and known as 4P in addition the company can do differentiate competitive in the delivery of services through three aspects known 3P in the marketing services. The population in this study is the customers that they have the bank account in the Sharia bank public and live in Gerbang Kertasusila area. Of that population, this study uses samples of 200 respondents. A method of sampling purposive is a technique for the determination of the sample based on c hance, it means that anyone who by chance or incidental meet, when they make a deal with the any Sharia bank or other place (home, office and etc.,) with the researcher can be used as the sample, if that person is considered suitable as a source of data. The results of research that marketing mix, the quality of services and the religiousness value significantly influences to the trust of customers. So, hypothesis are received. Services of marketing mix significantly influences to the commitment to customers. Then, hypothesis are received. The quality of services and the value of religiousness influence positively but not a sign of the commitment to customers and hypotheses is rejected. In short, the trust is significantly influenced by the religiousness value to the commitment to customers. Although, the trust cannt be significantly influenced the marketing mix to the commitment to customers. But the quality of services is significantly influenced to the commitment to customers.