The consensus among many analysts of the Nigeria–Biafra War is that the conflict cannot be reduced to a mono-causal explanation. The tragedy that befell the West African country from 1966 to 1970 was a combination of many factors, which were political, ethnic, religious, social, and economic in nature. Yet the conflict was unduly cast as a religious war between Christians and Muslims. Utilizing newly available archival materials from within and outside Nigeria, this article endeavours to unravel the underlying forces in the religious war rhetoric of the mainly Christian breakaway region and its Western sympathizers. Among other things, it demonstrates that, while the religious war proposition was good for the relief efforts of the international humanitarian organizations, it inevitably alienated the Nigerian Christians and made them unsympathetic to the Biafran cause.