It is true that the word “trinity” is not found in the Bible. It is also true that the Bible states that God is “one”. So why and how do most Christians state that God is a trinity? It is because that is exactly what the weight of biblical evidence indicates. We must remember that the term “one” can indicate one singular unit or one plural unit; that is, it can indicate one individual man or one “team” of men. For example, the Boston Celtics are one team consisting of more than one man. And, God does indeed refer to Himself in that context of being a plural unit. At creation God said, “let us make man in our image” (Genesis 1:26). Also, after the fall of man, God again referred to Himself in the plural context when He said, “man has become like one of us” (Genesis 3:22). Moreover, Jesus left no doubt when He stated that He and the Father constituted the two separate, individual witnesses required by Old Testament law (John 8:17-18), thus again teaching that God is a plural being. And, the Apostle Paul mentions blessings from three beings in his benediction to the Corinthians—God, Jesus Christ and the Holy Spirit (2nd Corinthians 13:14). The preceding passages, coupled with the scriptures that follow, are why we refer to God as a “trinity”. That is, one God manifest in three, distinct, divine persons.
The Bible clearly teaches that there is a “Father God” (Romans 1:7; !st Corinthians 1:3; Galatians 1:1; Ephesians 1:2; Philippians 1:2; Colossians 1:2; Matthew 6:9; John 4:23). And, the Bible also clearly states that the “Son of God”, Jesus Christ, is God (Matthew 1:23; Romans 9:5; 1st Timothy 3:16; Titus 2:13; Hebrews 1:8; John 1:1; John 5:18; Philippians 2:5-6; John 20:28-29; Isaiah 9:6). The problem with the trinity concept for many people seems to be with the “Holy Spirit” being God.
The name itself, Holy Spirit, is probably part of the problem. The spirit part of the name leads many to think of an impersonal essence or energy force. However, the Bible clearly portrays the Holy Spirit as a personal being, not as a “thing” or an “it”. The Holy Spirit has attributes of personhood. The Holy Spirit has a mind and a will, and He can pray and grieve (Romans 8:27; 1st Corinthians 12:11; Romans 8:26; Ephesians 4:30). Furthermore, Jesus repeatedly refers to the Holy Spirit as “He”, not as “it” (John 14:17; John 14:26; John 15:26; John 16:13-14).
But, are there any passages in the Bible that state or imply that the Holy Spirit is a divine being, God? Actually, there are a few scriptures that do so. Jesus states that any sin or blasphemy can be forgiven us except for blaspheming the Holy Spirit, which would certainly seem to indicate that the Spirit is God (Matthew 12:31; Mark 3:28-29). The angel, Gabriel, told both Mary and Joseph that Mary’s supernatural baby, the Son of God, would be born of the “Holy Spirit” (Luke 1:35; Matthew 1:20). If Mary’s baby is the “Son of God”, and if He’s born “of” the Holy Spirit, then the Holy Spirit has to be God. And, the Bible leaves no doubt in Acts 5:3-4, where Peter states that when Ananias and Sapphira lied to the Holy Spirit, they lied to “God”.
Thus, we have the “trinity”; God the Father is God, Jesus the Son is God, and the Holy Spirit is God.