Who is Jesus that he would say he is God's son?

God himself said so. As Jesus came up out of the baptismal waters, God’s voice was heard from heaven, saying: “This is my Son, the beloved, whom I have approved.” (Matthew 3:17) This marked a change in Jesus’ life.

Who are you to question Jesus? He do not have to lie about who his Father is. Since Jesus existed eons before you were ever born looks like you are going to have to take his word for it, you can't prove any different. But for the record, Jehovah Himself recognized Jesus as his Son at Matthew 3:17 which says: A voice from the heavens said: This is my Son, the beloved, whom I have approved. God cannot say it any plainer than what he said. Furthermore like all parents Jehovah recognized his own child.

Read the Bible

The Son of God.

He is the only human-born Son of God. John 10:30-33

Jesus isn't God, he is a man. There is only one God, the father, and it is forbidden to worship any others. We are all sons and daughters of God because he created us.

Jesus is The Son. Not the Father. I don't know what trinity believers are doing but they know good and well Jesus isn't the Father so they should be honest and say it like it is. Jesus is the Son of Someone and that someone is God. Son of God. That's Jesus. Matthew 16:15-17 is helpful if you need. Simple and nothing confusing.

You? But thou, Who are you?

HE WAS GOD IN THE FLESH AND EVEN BEFORE BECOMING HUMAN HE WAS THE WORD OF GOD...IMAGINE THAT...WALKING WORD OF GOD!! WOW!!

He was God incarnate, God as a human.