In what may seem as comparative religious studies, this work intends to undertake theological investigations in contemporary Black Africa with the Igbo tribe of south-east Nigeria as a case-study. This theological investigations are based on J.L. Austin's concept of performative word, and to be analyzed in the context of sacramental theology and the Igbo traditional religion, and then to give this concept a pastoral relevance in such a way that the use of Igbo word would be performative in evangelization among the Igbo themselves.