How many people through history have been killed in secular wars vs. religious wars?

Estimating the number of people killed in secular versus religious wars throughout history is complex, as it depends on definitions and interpretations of each type of conflict. Secular wars, such as World War I and World War II, are often associated with tens of millions of deaths. In contrast, religious wars, like the Crusades or the Thirty Years' War, have also resulted in significant casualties, but typically fewer in comparison to the largest secular conflicts. While some estimates suggest that secular wars account for a larger share of total war-related deaths, the specific numbers can vary widely based on the criteria used for classification.