>>509759111
Nigeria's rate is falling, just as it is everywhere in the world. Backwards countries are of course going to lag behind more advanced countries. But as they urbanize they will get there. Did you know India of all places is, thankfully, below replacement?
Consequently as they urbanize they will also forego their traditional beliefs for those more in keeping with their new way of life (feminism, sexual liberation etc). Ideology follows economic necessity.