Who is The Only One God According To Christ

Question: Who is the only one God according to Christ?
Answer: The Father

1After Jesus said this, he looked toward heaven and prayed: "Father, the time has come. Glorify your Son, that your Son may glorify you. 2For you granted him authority over all people that he might give eternal life to all those you have given him. 3Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent.

John 17:1-3, NIV