There is only One God, Creator of the universe, sovereign in all things, Who is perfect in character and knowledge. God is eternally triune. He is one in being, three in person, Father, Son and Holy Spirit.
Jesus is God in the flesh. The Second Person of the Trinity entered the world, born from the virgin Mary, lived a sinless life, and died an atoning death for our sins on the cross. His literal, bodily resurrection provides the basis for our confidence in His words, His power and His eternal authority over the church and the world.
The Holy Spirit is the Third Person of the Triune God. He inspired the infallible 66 books of holy scripture. Men are regenerated by the power of the Holy Spirit Who illuminates our understanding enabling us to recognize the truth. The Holy Spirit is essential to the work of salvation, instrumental in the process of sanctification and seals us unto the day of redemption.
Salvation is a gift of God, by grace alone, through faith. It is accomplished by the Holy Spirit, because of the work of Christ to the Glory of the Father. It is God's work, not man's work, and can only be received by faith.