The Lord's Resistance Army is a Christian group - their leader is a former altar boy. Most of the victims in Uganda are likewise Christians - this does not deter them. The massacres in Rwanda were also led by Christian militias, and had all these Bible quotes to urge them on.
The Lord's Resistance Army also makes raids into the Sudan, which is the only area they are likely to clash with Muslims.
Lord's Resistance Army follow a home grown religion with Christian elements. They have more in common with the old Chinese Taipings I reckon.