I argue that we must read Alasdair MacIntyre’s mature work through a Marxist lens. I begin by discussing his argument that we must choose which God to worship on principles of justice, which, it turns out, are ones given to us by God. I contend that this argument entails that we must see Mac- Intyre’s early Marxist commitments as given to him by God, and, therefore, that he has never abandoned them in his turn to Thomistic-Aristotelianism. I examine his reading of Marx, with its emphasis on the concept of alienation as a Christian concept, and explain how this reading differs from the dom- inant scientific-determinist reading of Marx. This examination then leads to a discussion of why MacIntyre abandoned both Marxism and Christian- ity in 1968. Finally, I turn to his more recent writing on Marx. I contend that if we view them through his argument about the principles of justice and which God to worship, we see MacIntyre’s mature philosophy as more Marxist than most people, perhaps even MacIntyre himself, would allow.