According to biblical sources, an invisible war is taking place in our universe. This battle happening in the unseen realm is manifested in the physical realm (Eph 6:12-18). Our world is a battleground filled with good and evil spirits at war with one another. Since the beginning of time, this spiritual war has affected the human experience (Gen 3:1-19). For the purpose of this project, spiritual warfare is anything that stands against, opposes, or hinders the gospel and the work and witness of God in a believer's life and in the church. Numerous authors have written about spiritual warfare and have attempted to explain the difficult doctrine concerning Satan and his angels, the world, the flesh, and their influence in the universe. Libraries contain research papers and books with theories on strategies and ideas for spiritual engagement. This book will define spiritual warfare as applied to the world, the flesh, and Satan (three enemies of believers in Christ).