Studies of the relationship between religion and economics can be divided into three major lines of research: behavioural economics of religion (microeconomic approach), macroeconomic consequences of religion and religious explanations of economic phenomena. Except for the third line strong evidence has been found on the microeconomic level of individuals and households that economic behaviour and outcome correlate with religion. Furthermore the role of religion on the macroeconomic level, e.g. the impact on economic growth, has been analyzed, too. However, only a few models integrating these two levels exist. In order to exemplify suchan integrated model, the first step of the analysis has to be the examination of the decisions taken on the microeconomic level. For this purpose this paper focuses on rational incentives to be religious and to take part in religious activities without taking into account the benefits derived from religious believes itself.