God is one God, yet three distinct persons: Father, Son, and Holy Spirit. Notice all the scriptures that demonstrate interaction between the persons of the Godhead. The Son prays to the Father; the Father speaks to the Son; the Son sends the Holy Spirit, and many others too numerous to mention. How else can these verses be explained?
"And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased."