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Faith is the key word and axis of Islam. To attain happiness and salvation in all divine religions is possible only in the light of faith. Since the reality of faith is immaterial such as hope. love and piety and are subjective in nature so it is impossible to give a clear definition of it. Hence in Islamic culture too no clear definition have been proposed.
As for other issues such as the synonymy of faith and Islam and their other parts and the relation of faith with action and its intensity, these were considered by khawarij first as political issues and then were considered as theological issues. Scholars have proposed various views
concerning the parts and intensity of faith and so far no clear view have been posed. This article is an attempt to make clear the relation of faith and Islam, the parts of faith, and to prove its intensity.