Decisions made customers closely related to the 
behavior of Muslim consumers in deciding to buy a 
product. Muslim consumer behavior is closely related 
to the principles of clean and unclean paradox of 
goods and services that they consume. As well as 
spending in the way of Allah means that they continue 
to put the interests of social expenditures in the form 
of zakat, donation and charity. 
PT BRI Syariah KCP Kopo Bandung is a business 
unit engaged exclusively serve the banking services 
based on Islamic principles. Based on the data 
acquisition that an increasing number of customer 
savings Syariah BRI KCP Kopo Bandung increasing 
every year. This happens because customers will 
benefit from the knowledge of existing savings 
products to the Syariah BRI KCP Bandung Kopo is 
increasing and the price of services of Islamic banks 
in the form of profit-sharing finance affordable by 
customers. The profit sharing arrangement contained 
in Shariah Bank that affect the customer's decision to 
choose shariah bank. Judging from products that have 
a more favorable outcome for the customer compared 
to conventional banks. 
Research conducted Khasanah & Gunawan 
(2014) and Daulay (2010) states that the system of 
profit-sharing system has a positive and significant 
impact on the decision to save in Islamic banks. 
Research conducted Lestari (2015) and Masiur, 
Arfan, and Shabri (2015) states that the factor of 
religiosity is very significant effect on the decision to 
vote in Islamic banks. 
Based on the problems arising above, the author 
interested in conducting research under the title 
Impact of Knowledge of Sharing Ratio and Family 
Religiousity Environtment to Customer Decision. 
2 LITERATUR REVIEW 
2.1  Consumer Muslim Behavior 
Schiffman and Kanuk (1994) defines consumer 
behavior is as shown consumer behavior in locating, 
purchasing, using, evaluating and spent products and 
services that they expect will satisfy their needs. 
Unisex which states that consumer behavior is an 
action that is directly involved to acquire, consume 
and spend your products and services, including the 
processes that precede and follow this action. 
(Sumarwan, 2002). 
Muslim consumer behavior can be identified: 
(Wibowo & Supriadi, 2013). 
1.  The paradox of Halal-Haram 
As we know that Islam has noticed the quality 
and purity of goods to be consumed as 
manifested in the Quran and Hadith.  
2.  Principles of Mercy / Spending in the Way of 
Allah 
The principle of a Muslim consumption is 
generosity and social and altruistic widely, in 
contrast to conventional principles that 
maximize individual satisfaction with ignoring 
others. Therefore, Muslim consumers still get 
the maximum satisfaction level even though 
their income for consumption and expenditure 
divided in the way of Allah (zakat, donation, 
charity). 
2.2 Consumer Decision 
Decision-making process often involves some 
decisions. A decision involving between two or more 
alternative actions (or behaviors). Arise purchasing 
decisions for their purchases of goods or products 
objective to be fulfilled. Kotler & Armstrong (2008: 
149) states that "Purchase decision is the buyer's 
decision about wich brand to purchase". While 
Schiffman and Kanuk (2007: 625) defines a buying 
decision sebahai following: "A decision on action is 
a selection from two or more alternative choice". (The 
decision to buy is a choice of two or more alternative 
choices). 
Kotler (2000: 185) states that the decision-making 
process is a problem-solving approach that consists of 
five phases as follows:  
1.  Intro to problem 
2.  Search Information 
3.  evaluation of Alternatives 
4.  Buying decision 
5.  Post-Purchase Behavior 
In Islam, the decision-making process is described 
by Al-Qur'an is more general in nature, meaning that 
can be applied in all activities. In addition the concept 
of decision-making in Islam more emphasis on 
fairness, this is based on the example of the attitude 
of judges must firm and fair in deciding a matter of 
justice. As stated in the Al-Imran ayat 159 the 
following: 
 
             
 159   
 
Meaning: "So due to the grace of Allah do you apply 
gentle towards them. If you were to be harsh again be 
rude, they would distance themselves from all around 
you. Therefore pardon them and ask forgiveness for 
them and consult them in the affairs. Then when you