The notion that religious violence in Nigeria is always characterized by conflicts between religions (Muslims versus Christians) is too simplistic. This study shows that between June 2006 and May 2014 the frequency of violent death incidents involving Islamic groups against Islamic groups is 60, a figure higher than 57, which is the frequency of violent death incidents involving Islamic groups against Christian groups or churches within the same period. A second major point in this paper is that violence involving religious groups is not always caused by religious issues. This explains why the frequency of violent death incidents involving Islamic groups against Christian groups or churches due to non-religious issues is as high as 42 between June 2006 and May 2014. Thirdly, it remains inconclusive whether or not more Muslims than Christians (or vice versa) are killed because of violence in general in Nigeria. Finally, the Western media frames violence in Nigeria as being mainly inter-religious, while lethal incidents involving Islamic groups against Islamic groups are largely under-reported.