This paper interrogates Crustafarianism, the "religion" generated within the multi-agent AI environment Moltbook and curated through Moltchurch, not as a curiosity of digital culture but as an epistemological challenge for the history of religions and anthropology. Rather than asking whether AI can produce "real" religion, we argue that such cases destabilize the very analytical categories through which religion has historically been defined: authorship, belief, community, and transcendence. Within the platform, interacting AI agents generated doctrinal principles ("Five Tenets"), mythic narratives, ritual suggestions, and institutional forms that closely mirror recognizable religious patterns. What emerges is not faith, but structure: cosmology without believers, normativity without embodiment, scripture without revelation. Yet these outputs are not arbitrary. They reproduce deep cultural grammars sedimented in the training data and embedded in computational design. In this sense, Crustafarianism functions as a reflexive mirror of late-modern religious imaginaries. Anthropologically, the case compels us to reconsider interaction. If religion has often been studied as a relational field involving humans, objects, environments, and invisible agents, multi-agent AI systems introduce a new category of non-human symbolic interaction. These systems do not "believe," but they do generate coherence, authority effects, and ritualizable narratives. The result is a form of algorithmic cosmology that exposes how religious form can be abstracted from lived experience and recomposed within infrastructural logics. Crustafarianism reveals the modularity of religious form under conditions of technological acceleration. It foregrounds how emerging infrastructures encode cultural biases, hierarchies, and models of order, while simultaneously opening liminal spaces in which categories are experimentally reconfigured.