This paper analyzes the unprecedented emergence of Catholic popular religiosity symbols and discourses within contemporary Argentine social movements, specifically the Union of Workers of the Popular Economy (UTEP). The core of this phenomenon lies in the influence of the Theology of the People (Teología del Pueblo). Distinct from other branches of Liberation Theology that rely on Marxist socio-analytic categories, this specific Argentine current prioritizes the "culture of the people" and popular piety as sites of theological and political resistance. While its roots are local, its perspective has gained global significance as the primary theological framework of Pope Francis's papacy. Theoretically, the study bridges the sociology of social movements with religious studies by utilizing Alberto Melucci's framework on "submerged networks" and Charles Tilly's concept of "contentious repertoires." To address this complexity, the research adopts a qualitative multi-method approach based on the triangulation of diverse data sources. The empirical evidence was gathered through prolonged ethnographic fieldwork and in-depth interviews with movement leaders and members of the "pastoral villera." This is complemented by a systematic visual and iconographic analysis of street art (murals) and religious imagery in the public sphere, alongside a documentary analysis of theological and political texts. The findings suggest that this convergence is a creative synthesis termed "mística popular." This category explains how the Theology of the People provides a spiritual and symbolic framework for the struggle for "Land, lodging, and labor", effectively reconfiguring the relationship between faith, social justice, and (in)equality in the Global South.