The doctrine of God remains as important as ever. The Apostle Paul rebuked the Corinthians in the first century for accepting "another Jesus" and "a different gospel" (2 Cor 11:4). Denial of the deity of Christ and the Holy Trinity were no doubt among the falsehoods condemned by Paul as "doctrines of demons" (1 Tim 4:1). Christians need to know the biblical basis for these beliefs, in view of the many historic heresies and recent fashionable nonsense such as open theism and process theology. My emphasis is on a listing of many scores of relevant Bible passages (systematic theology). Additionally, I attempt to explain "theology proper" in laymen's terms, so that, with the aid of this book, soaked with Scripture, anyone will be able to defend the biblical (and Nicene, Chalcedonian) truths of the Holy Trinity, Jesus as the incarnate God, and the divinity of the Holy Spirit. The coherence and truthfulness of orthodox, biblical theology of God is evident, the more these passages are understood.