The overt subject of this paper is Terry Eagleton's theological turn, but its implicit subject is the trend of turning to the Christian tradition and theological sources in contemporary Western academia, particularly left-wing thinkers, in order to come to terms with the social reality and theoretical issues in the so-called postmodern period. To this end, this paper intends to find certain particular implications of Eagleton's theological turn by tracing the development of his thought and analyzing key concepts in his theorizing. Included amongst them are the theoretical sources and grounding, the main content and significance, and their) relation to Western Marxism or left-wing theological thought of this theological turn.