God
It is the testimony of both Testaments and of the Christian Church that God is both One and Triune. The Biblical revelation testifies that there is only one God, and that He is eternally existent in Three Persons: Father, Son, and Holy Spirit.
God the Father is the Creator and sustainer of all things, who created the universe in love to respond to Himself. He created man in His own image for fellowship, and calls man back to Himself through Christ after the rebellion and fall of man.
Jesus Christ is eternally God. He was together with the Father and the Holy Spirit from the beginning, and through Him all things were made. For man's redemption He left heaven and became incarnate by the Holy Spirit of the Virgin Mary and henceforth He is forever one Christ with two natures, God and Man, in one Person.
The Holy Spirit is God, the Lord and giver of life, who was active in the Old Testament, and given to the Church in fullness at Pentecost. He empowers the saints for service and witness. He imparts the life of Christ to the believer through the new birth experience and works to conform the believer to the image of Christ. The baptism in the Holy Spirit, subsequent to conversion, releases the fullness of the Spirit in the life of the believer and is evidenced by tongues, joy, praise and other inward and outward manifestations.