In modern times, the Christian church has adopted the use of the Bible as the fundamental book of religious belief and practice. The Bible is the best guide for life, and the Christian religion is based on it. The Biblia Takatifu ya Kiswahili app contains the Old and New Testaments, which are sacred books that are revered by the Christian church. The Old Testament tells the story of the creation of the world and the events that took place in the early history of humanity, while the New Testament gives an account of the life of Jesus Christ and his teachings, and his role as the Son of God.