The connection between religion and conflict is widely known, but the literature lacks in the understanding on how religion can be used in conflicts. This study aims to investigate how religion was used by paramilitary organizations in the North Ireland conflict. With the theory on how religion can overcome collective action problems, four central themes regarding how religion can benefit social movements was used to examine these organizations. The organization was analysed using journalistic sources mainly based on interviews with terrorists from these organizations. Using these four themes the similarities and differences between these organizations could be analysed and how religion was used could be better understood. The main result was that none of the studied organizations used religion to a big extent, but that the protestant side had a bigger use of it than the catholic one. With this in concern, the study was critically analysed, and further research was purposed.