I did not deny that Jesus is God.
Yes, you have. We presented several different scriptures that show He is God and you denied that any of them show that He is God. Tell me, do you believe that Jesus created all things as scripture teaches?
Rather, I reject the doctrine that Jesus has two natures. Jesus is a man by nature. He didn't exist before he was born.
And here you've done it again. He can't be God if He didn't exist before He was born. He existed as God before He was born as a human being. That's why it says He would be called Emmanuel because that means "God with us". By being born as a human being, God came down to us from heaven. Jesus is fully God and fully man. You deny this and that makes you a false teacher. You are denying a fundamental belief of Christianity.
He was born to the virgin Mary; he got tired, he rested, he ate he prayed, he grew in wisdom, he was tempted, he has his own will. James says that God can't be tempted; Jesus was tempted. His temptation was real. Do you deny that Jesus was a man?
Of course I don't, but I don't foolishly deny that He is God like you do. I believe He is both God and man, as scripture teaches.
Colossians 1:15
The Son is the image of the invisible God, the firstborn over all creation. 16 For
in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities;
all things have been created through him and for him. 17 He is before all things, and in him all things hold together.
Colossians 2:9 For
in Christ all the fullness of the Deity lives in bodily form, 10 and in Christ you have been brought to fullness. He is the head over every power and authority.
You say that Jesus didn't exist in any way, shape or form before He was born of the virgin Mary. Scripture says "in him all things were created" and "He is before all things".