The difference in Christianity and Islam comes down to a difference of authority and appeal to authority. The Christian wants to appeal to the Bible and the Muslim wants to appeal to the Qur’an. You can not stop by saying: ‘This is true because me book says it is’, and somebody else would say something else is true because my book says differently, you can not stop at that point, and the Qur’an does not.
The Christians may point to some words that it is recorded Jesus said and say this proves my point. But the Muslim does not simply open his book and say: ‘No, no the Qur’an says this’, because the Qur’an does not simply deny something the Bible says and say something else instead. The Qur’an takes the form of a rebuttal, it is a guidance as the opening says (Huda lil mutakeen). So that for every suggestion that the Christian may say: ‘My Bible say such and such’, the Qur’an will not simply say: ‘No that is not true’, it will say: ‘Do they say such and such then ask them such and such’.
You have for example the Ayah that compares Jesus and Adam. There are those who may say that Jesus must have been God (Son of God) because he had no father. He had a woman who was his mother, but there was no human father. It was God that gave him life, so he must have been God’s son. The Qur’an reminds the Christian in one short sentence to remember Adam – who was his father ? – and in fact, who was his mother ? He did not have a father either and in fact he did not have a mother, but what does that make him?
So that the likeness of Adam is the likeness of Jesus, they were nothing and then they became something; that they worship God.