This study seeks to investigate the history of Anglican / Methodist cooperation among the Yoruba-speaking peoples of Nigeria during the missionary era and after. The intention is to show that the institutional and doctrinal form of unity inherited from the missionaries, although very useful, was predominantly designed and structured for a Western way of life. Thus, this imported ecumenical method was inadequate in enabling churches in Nigeria, particularly Anglican / Methodist ones, to deal with the overwhelming contemporary problems facing Nigerian society. Therefore, new ecumenical theologies are propounded within a Nigerian context to meet this goal.