Answering Jesus divinity is disproved because he said the Father is Greater
Jesus said in John 14:28
You have heard how I said unto you, I go away, and come again unto you. If you loved me, you would rejoice, because I said, I go unto the Father: for my Father is greater than I.
So being that the father is greater than Jesus disprove his divinity and to refuse that following are the arguments
First: Jesus is both God and Man
Unbelievers can not understand the nature of Christ Jesus until they understand that in nature he is God but in the same time he is man, and that the bible teaches us he humbled himself to be a servant who obeys the father to accomplish the mission of the salvation for mankind, also in the process of his coming in flesh he emptied himself from the glory of divinity in all aspects including the matter of being all knowing.
And that is exactly what the scripture teaches in
Let this mind be in you, which was also in Christ Jesus:
Who, being in the form of God, thought it not a thing to be grasped to be equal with God:
But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
Second: Yes God the divine father is greater than Jesus the man
So yes God the divine father is greater than Jesus being humbled himself into the nature of man for sure, but that does not mean from divinity prospective that the Father First member of the trinity is greater than the Son second member of the trinity, and that is very clear in Philippians 2:5–8 as it says that Jesus is “Equal with God” but in the same time he “took upon him the form of a servant”
And the bible says that the servant can not be greater than his master according to John 13:16
Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him.
This really divine inspired book called the bible you will always find that scripture is explained by another scripture but read it with in fully in context and with good intentions, do not read the bible with hidden agenda
Third: Jesus says that he is omniscient and omnipotent
In the same chapter where Jesus said the father is greater than himself, he said that he is God as he says in John 14:14
If you shall ask anything in my name, I will do it.
Simply is saying he is able to listen to every believer and respond to the prayers of every believer, so simply he is saying that he is omniscient and omnipotent
Third: Jesus says that he is omnipresent
Again in the same chapter in John 14:20 Jesus said to talking to everyone who is following him
At that day you shall know that I am in my Father, and you in me, and I in you.
So he is omnipresent in all the believers in him
For More about Jesus divinity we recommend this PDF book
Putting Jesus in His Place
Also read how The Quran didn’t deny that Christ the Lord was not ashamed to come as a servant