During the last three decades, ones marked with a growth in comparative studies in religion, the need of the theological discipline to embrace not only one but all great religions of world has been often discussed. Cantwell Smith is one of the leading advocates of the vision of global theology or, using his own term, . He sees it as a "theology of the religious history of humankind. It is a theology of comparative religion which is constructed by all, and therefore "acceptable to, even cogent for all humankind. With this global theology, Smith anticipates a "world process of religious convergence." Smith emphasizes that global theology is 'a theology for which 'the religions' are the subject, not the object; a theology that emerges out of 'all the religions of the world', all the religious communities of the world, or all the religious sub-communities of the human community. In other words, global theology as a future discipline must be 'a theology of the religious history of humankind' or 'the faith history of us human beings'. Although Smith believed that such a global theology on the bases of the unity of the history of religion, faith as a universal human quality and thus as a common essence of religions, and the possibility of a new mode of knowledge beyond both scientific objectivism and sectarian subjectivism is possible, but the loss of convergence in some of philosophic presupposes of different religions, especially revealed religions and non-revealed ones, makes its realization impossible.