The aim of this research is to explain the leadership model and theological strategies of Imam Hadi (a.s.) in facing the intellectual crises of the Abbasid era - especially in the three fundamental issues of monotheism, faith, and the creation of the Quran. For this purpose, the present research has been collected and analyzed using a descriptive-analytical method and based on first-hand narrative-historical and theological data. The findings of the research indicate that Imam Hadi (a.s.) countered deviant ideas by intelligently utilizing strategies such as compiling precise theological discourse (on the issue of monotheism to confront the pseudo- and exemplified), rational interpretation of religious issues (on the issue of the creation of the Quran to overcome the dualism of the Mu'tazilites and Hanbalites), and purposeful debates (to purify the divine essence). By presenting a pure reading of monotheism, explaining the levels of faith, and rejecting the theory of the creation of the Quran, he not only sought to dispel doubts in the Islamic community, but also established the framework of the Shiite ideological system in one of the most challenging periods in Islamic history. As a result, this research shows that Imam Hadi (a.s.)'s theological positions had internal coherence and a strategic approach, and played a decisive role in protecting the Shiite identity from the scourges of eclecticism and deviation.