thinking on position of religion in the political ethics in the West

religion as an important components of good life perform a special rule in targeting in Human's life and amendment the current situation for achieve a Better situation.yet the rule of social contexts in human's life caused that thinkers focus on the relation between society and the good life and political ethics has a classic responsibility in this issue and present a result about the relationship between the state and the good life. This paper is written for survey the evolution of political ethics in the west and after analysis the
Christianity's changes from medieval to Contemporary era , will study the dominant political idea named neutrality about religion by state and finally will study a critical approach that named Perfectionism that was revived by some Western perfectionists in the late twentieth century. This approach in critique the plural ethics in the west , Demands for the revive of religion as a source of ethical norms and emphasizes on the state's responsibility about the good life.