This thesis investigates practices and beliefs of an African diaspora migrant church. The question this thesis seeks to answer is why are some of the second-generation members frustrated while others are leaving the church. The Church of Pentecost is a migrant church with its foundations in Ghana. In the UK, the Church of Pentecost appears to be flourishing, however, there seems to be a growing number of young people who claim to be frustrated whilst others are leaving the church. Subsequently, the focus of this thesis is to trace the contours of transition in the church and, ultimately, to find out why some of the second-generation members are disengaged and why others are leaving the church. As a Pentecostal church, one of the key areas of doctrine and practice is matters concerning spirits and the Holy Spirit. The study therefore used Ghanaian cosmology as well as Pentecostal practices and emphasis on Holy Spirit as a framework in its investigations. The thesis showed that although other significant factors contribute to some of the second-generation members' frustration within the church, the first generation's emphasis on spirits has played a vital role in the second generation's approach to church.