I'd not say that Jesus is 'just' the Son of God, He's much more than that. But He's not God.
I would ask "What did Jesus say about himself?".
Jesus Said He Existed Before Abraham
"Your father Abraham rejoiced as he looked forward to my coming. He saw it and was glad."
The people said, "You aren't even fifty years old. How can you say you have seen Abraham?"
Jesus answered, "I tell you the truth, before Abraham was even born, I Am!"4
Jesus Said to See Him is the Same as Seeing God
Jesus shouted to the crowds, "If you trust me, you are trusting not only me, but also God who sent me. For when you see me, you are seeing the one who sent me. I have come as a light to shine in this dark world, so that all who put their trust in me will no longer remain in the dark."5
"No one can come to the Father except through me. If you had really known me, you would know who my Father is. From now on, you do know him and have seen him!"
Philip said, "Lord, show us the Father, and we will be satisfied."
Jesus replied, "Have I been with you all this time, Philip, and yet you still don't know who I am? Anyone who has seen me has seen the Father! So why are you asking me to show him to you?"6
Jesus Said He Could Forgive Sins
"...that you may know that the Son of Man has authority on earth to forgive sins"--he then said to the paralytic--"Rise, pick up your bed and go home." And he rose and went home. When the crowds saw it, they were afraid, and they glorified God..."7
He said to them, "You are from below; I am from above. You are of this world; I am not of this world. I told you that you would die in your sins, for unless you believe that I am he you will die in your sins."8
Jesus Said He Is the Judge and Can Grant Eternal Life
"For as the Father raises the dead and gives them life, so also the Son gives life to whom he will. The Father judges no one, but has given all judgment to the Son, that all may honor the Son, just as they honor the Father."9
Jesus said to her, "I am the resurrection and the life. Whoever believes in me, though he die, yet shall he live."10
"My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand."11
"For it is my Father's will that all who see his Son and believe in him should have eternal life. I will raise them up at the last day."12
Jesus Said He Was the Same as God
"The Father and I are one."
Once again the people picked up stones to kill him.
Jesus said, "At my Father's direction I have done many good works. For which one are you going to stone me?"
They replied, "We're stoning you not for any good work, but for blasphemy! You, a mere man, claim to be God."13
Most importantly, Jesus said he was God. If it is not true, would he have lied.
Jesus, in response to the Pharisees’ question “Who do you think you are?” said, “‘Your father Abraham rejoiced at the thought of seeing my day; he saw it and was glad.’ ‘You are not yet fifty years old,’ the Jews said to him, ‘and you have seen Abraham!’ ‘I tell you the truth,’ Jesus answered, ‘before Abraham was born, I am!’ At this, they picked up stones to stone him, but Jesus hid himself, slipping away from the temple grounds” (John 8:56–59). The violent response of the Jews to Jesus’ “I AM” statement indicates they clearly understood what He was declaring—that He was the eternal God incarnate. Jesus was equating Himself with the "I AM" title God gave Himself in Exodus 3:14.
If Jesus had merely wanted to say He existed before Abraham’s time, He would have said, “Before Abraham, I was.” The Greek words translated “was,” in the case of Abraham, and “am,” in the case of Jesus, are quite different. The words chosen by the Spirit make it clear that Abraham was “brought into being,” but Jesus existed eternally (see John 1:1). There is no doubt that the Jews understood what He was saying because they took up stones to kill Him for making Himself equal with God (John 5:18). Such a statement, if not true, was blasphemy and the punishment prescribed by the Mosaic Law was death (Leviticus 24:11–14). But Jesus committed no blasphemy; He was and is God, the second Person of the Godhead, equal to the Father in every way.