Jesus is the one true God.
However, the concept of the Trinity is a mischaracterization of God. It is not that God is three persons or who's or that there is anything special about the number three in regard to the essence of God. The Biblical concept is that there is simply one true God and this one God was manifested in the flesh. What Trinitarians call distinctions of persons in the Godhead is a misunderstanding. Relationships and distinctions are due to the genuine humanity of Christ.
Jesus said his father is the only true God...
1These words spake Jesus, and lifted up his eyes to heaven, and said, Father, the hour is come; glorify thy Son
, that thy Son also may glorify thee:
2 As thou hast given him power over all flesh
, that he should give eternal life to as many as thou hast given him.
3 And this is life eternal, that they might know thee the only true God
, and Jesus Christ, whom thou hast sent.
4 I have glorified thee on the earth: I have finished the work which thou gavest me to do
Jesus was working for his father. Therefore your God was employed by my God