The Qurʾān makes this clear in the following verse,
Christ the son of Mary was no more than a messenger; many were the messengers that passed away before him. His mother was a woman of truth. They had both to eat their (daily) food. See how Allah makes His signs clear to them; yet see in what ways they are deluded away from the truth!
Similarly, both Muslims and Christians believe that Jesus had miracles. He healed the sick and brought the dead back to life. However, Islam teaches that Jesus peace be upon him did not do this one his own, but through God. Similar to how both religions do not teach that Moses is God because he split the sea. Moses did this through God. Similarly, Jesus was a Prophet who perform these miracles by the will of God and they do not prove divinity in anyway.
And [make him] a messenger to the Children of Israel, [who will say], ‘Indeed I have come to you with a sign from your Lord in that I design for you from clay [that which is] like the form of a bird, then I breath into it and it becomes a bird by permission of Allah. And I cure the blind and the leper, and I give life to the dead – by permission of Allah. And I inform you of what you eat and what you store in your houses. Indeed, in that is a sign for you, if you are believers
(Q. 3: 49)
Some might argue that Jesus was divine because he was born miraculously. However, that also does not establish divinity because Adam was also created miraculously, without a mother or father.
The similitude of Jesus before Allah is like that of Adam; He created him from dust, then said to him: “Be”. And he was.
The most logical conclusion concerning Jesus peace be upon him is that he was a messenger just like previous messengers who preceded him. Therefore, Islam calls all Christians to return to the actual true teachings of Christianity and Jesus. Those teachings are that there is only one God, He has no offspring, helper, or partner.