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Ideology may directly provide motive and indirectly capacity for collective violence, thus making armed conflicts longer and bloodier. We investigate these propositions by drawing on an innovative global dataset which codes ideological claims by rebel groups and governments in intrastate armed conflicts since 1946. Results demonstrate that although ideology increases conflict duration, these effects vary by type and timing. Whereas secular ideological conflicts tended to be more protracted during the Cold War, religious ideology has become increasingly important since. We, however, find little evidence that ideology increases conflict intensity. Rather, rebel criminality best accounts for intensity. So, while immaterial resources like ideology sustain willingness to fight, ideology’s influence upon conflict intensity is limited, especially after the Cold War. Future studies need to take ideology seriously and need to investigate its characteristics more in-depth and in conjunction with material, identity related and international variables.

Anecdotal evidence from many armed conflicts suggests that religion incites violence. Theoretically speaking, several facets of religion can create motives and opportunities to overcome the collective action problems associated with organized violence. However, empirical research has hitherto found no conclusive answer on the extent to which religion is connected to armed conflict onset. Contributing to the filling of this gap, we use a new database that incorporates important religious factors that previous studies left largely untested. The data set covers 130 developing countries for the period 1990 to 2010. Results from logistic regressions confirm our expectation that certain religious factors fuel armed conflict—in particular, the overlap of religious and other identities, religious groups’ grievances, and religious leaders’ calls for violence. We also find that religious determinants vary in their impact according to whether conflicts are religious or not in origin.