A Reflection on Realm of religion

The problem "realm of religion" is one of important questions of philosophy of religion which is related to such important problems as "definition of religion", "relation of religion with politics", " function of religion" and "kernel and shell of religion". The question is the extent to which religion can play its part in secular affairs and material needs. In regard to livelihood matters what guidance is given by religion? In other words, how far is the extent of religion and how much can object of piety be extended? In answering to these questions there are two maximalist and minimalist theories. This article is an attempt to give a conceptual analysis to the concept of religion and study its domain from viewpoint of some Islamic thinkers.