Abstract: This article examined the social problem of the proliferation of Churches and moral decadence in Nigeria with a focus on Pentecostal ministries, from the humanistic point of view. The study engaged majorly secondary data in an attempt to study this phenomenon. It presented both the positive and negative impacts of Pentecostalism in Nigeria. It also indicated several manifestations of moral decadence in spite of Church growth and its causal factors. The study equally looked at the socio-economic and religious implications of Church proliferation with moral decadence. The study ends with concluding remarks and also proffers the way forward.