Jesus Preached God's Oneness
Jesus Christ, as a true Prophet of God, taught monotheism. When asked, 'What is the first of all commandments', Jesus replied:
"...The first of all the Commandments is, Hear O Israel; the Lord our God is One Lord" (Mark 12:29)
"And this is life eternal, that they might know thee the only true God and Jesus Christ whom thou has sent" (John 17:3)
What did Jesus Say about Himself?
In many places in the Bible, Jesus, referring to himself as a Prophet said:
"A Prophet is not without honor, save in his own country, and in his own house" (Matthew 13:57),
"Nevertheless I must walk today and tomorrow and the day following, for it cannot be that a Prophet persists out of Jerusalem". (Luke 13:33).
Jesus Received God's Revelation
Similarly, Jesus Christ too, as a Prophet, received revelations from God: "But now you seek to kill me, a man that had told you the truth, which I heard of God" (John 8:40)
Jesus Prayed to his God
"And when he (Jesus) had sent the multitudes away, he went up into a mountain apart to pray" (Matthew 14:23)
Obvious question: If Jesus was God, who was he praying to?
Jesus put himself Equal to other Humans
Jesus put himself equal to other humans in the eyes of God.
"My father and your father, my God and your God" (John 20:17)
God does not have a God, But Jesus had a God! Moreover, the gospel writers referred to Jesus Christ (peace be upon him) as the 'son of man' about 85 times in the Gospels, and never once did he explicitly called himself 'God', or 'God the Son', or 'The Begotton Son of God'.