The purpose of this thesis is to understand the way in which religion and politics played a role in the formulation of a cyclical ethos of conflict, focusing in the last and most important civil war of nineteenth-century Colombia: The War of the Thousand Days (1899-1902). A historiographical review was used to understand the interactions between these two structures, and it pointed at a main problem centered in the political use of religion, as well as the transformation of political debate into a matter of political faith. In conclusion, the War of the Thousand days strengthened narratives of vengeance, worsened the situation of the country, and solidified an ethos of conflict in which the State used the Church to legitimize itself against the threats to the status quo of systemic inequality.