Journalist Alan Isaacson provides a helpful study of this phenomenal ministry in his book Deeper Life, talking with many members of the church who told him how Christ has miraculously intervened and changed lives in response to prayer and the proclamation of the Gospel. In Pastor Kumuyi's own words: "God, in the growth of Deeper Life Bible Church, has strategically and prudently used miracles to ‘make all men come to Him' (John 3:26). We take Christian living and holiness seriously."
According to Isaacson, “The history of Deeper Life is very much the personal story of W.F. Kumuyi. He is a gifted man, clear-thinking and humble. He is a dedicated Christian and deserves the title ‘the man of God,' which his followers have given him. Since he was a young man, Kumuyi has devoted his time to reading and studying the Bible. He knows the Scriptures inside out, and has struggled to understand and apply them. As he shares that struggle and his love for the word of God, so people have been drawn to him for advice, or simply to listen. When he preaches, his message is clear, simple, and profound. Poor street traders who can barely read sit next to university professors, all equally captivated by the way Scripture becomes suddenly relevant to them.