There is only one God, i.e., Father, Son, and Holy Spirit are the same one God and one Spirit. There is no such thing as three Gods in one. The trinity doctrine is simply a materialistic spin on the concept of the Godhead. God is Spirit, yet to suit our own tastes people have tried to “materialize” God in the form of idols, saints, or trinitarian doctrines. God called Himself “us” in the Bible (Gen 1:26; 3:22; 11:7; Jn 17:22), which may seems like separate identities and persons; however, we can better understand God’s three parts (Father, Son, and Holy Spirit) as different functions at various stages of world history than as three different persons. For example, we would not say Joe, a father to Sam and the son of Mike, who goes to work as a carpenter is three different people. Joe is Joe, regardless of which functions/roles He is working in.
The Holy Father revealed the power of creation (Gen 1:1); the Son revealed salvation (Rom 3:24); and, the Holy Spirit reveals God’s will and guides God’s people (Jn 16:13). Yet we cannot say God is three different persons in one body, for they are all one (Jn 10:30). God is one. The Jewish people never believed in more than one God, for that is the essence of monotheism. Christianity, in the tradition of Judaism, never believed in more than one God. Only years after Christ died did the controversy over Christ’s divinity begin and did people come up with the doctrine of trinity or tri-unity. Like a man who is made up of spirit, soul, and body, God cannot be separated into three persons. God is the one and only. When Jesus was born, Isaiah the prophet called Jesus the “Mighty God” and “Everlasting Father” (Isa 9:6). In Hebrews 1:8, Jesus is referred to as a God. Acts 5:3 tells us He who deceives the Holy Spirit deceives God. Jesus said He came from heaven yet was still in heaven (Jn 3:13 KJV). All this shows that God is one and not three Gods in one. As stated earlier, we have limited knowledge of God’s divine nature. Like seeing a poor reflection in a mirror, we are limited because we are flesh not spirit. One day, we hope to see God face to face and know God fully, just as Christ knows us fully (1 Cor 13:12).