Who is God? Better yet, what is God? Can we know for certain that He exists? If so, how? How can God be one yet three? How can Christ be both God and man? This workbook is a study of the nature, existence, and attributes of our Trinitarian God. In it we will examine the biblical evidence and historical development of our understanding of the doctrine of the Trinity, person of Christ (Christology), and the person of the Holy Spirit (Pneumatology).