In his sermon on James 4:1–12, Dr. Kayumba explores the theme “Friendship with the World: A Dangerous Alliance”. He begins by highlighting the root of conflict, describing it as an inner war driven by selfish desires and hostility, particularly among believers. These desires—such as greed, control, and a longing for worldly gain—lead to spiritual adultery, which James describes as enmity with God. Becoming a friend of the world is not a trivial matter; it places one in opposition to God. Dr Kayumba emphasises that the Christian must respond by submitting to God, resisting the devil, and drawing near to Him through humility and truth. He urges believers to build a community marked by grace, to examine themselves before blaming others, and to maintain humility in all pursuits—academic and spiritual. He concludes that resisting worldliness is only possible through a deep and continual closeness to God.

The African Christian University, founded by the Reformed Baptist Church Association of Zambia, aims to glorify God in the pursuit of truth. Through this mission, they inspire students to use their talents and education to transform their communities and foster cultural renewal in Africa.