How many religiously-motivated murder groups are there in one country?

Bloodthirsty Nigeria 'cult' killings spark fear.  People cover their noses at the stench of death in the Crystal Church of God in Owode Onirin, just outside Lagos, where bloody clothes, drums, bibles and hymn books still litter the bare floor.  Three days earlier, four worshippers were killed as they prayed, in the latest murders blamed on a shadowy gang dubbed the Badoo, believed to have killed 30 people since June last year.  Daily Times