Doctrines are a part of each religion. To believe in God is a fundamental doctrine in world religions. The trinity has a vital root in Christianity. Qur’an explores the trinity according to the divine dimension in Islam. Being closer religions, Christianity and Islam have sometimes a sense of understanding because of revelation. This study explores the right way of philosophy in the Trinity. In particular, the present research thoroughly addresses the following key questions for the matter of Trinity in the Christianity and Islam: what is the Trinity? How can be defined the Trinity with the word philosophy or doctrine? What are the historic procedures to develop the Trinity by the figures in Christianity? What do the divine sources; Qur’an and Bible present the fundamental principle toward Trinity? Both community members may have a positive understanding of communal tolerance and humbleness in the development of an inclusive society in the country. In the sense of Philosophy, divine books have the right direction to keep to the right way of acquiring human knowledge with divine guidance. It is a purposeful study with intellectual themes even in the contemporary world as well as in the previous history of humanity. This study opens a new avenue of research with comparative and analytical methods.

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