What is the difference between Christianity and Islam in Feudal Europe?

You can write a paragraph or two, or you can just gives me a few sentences, I just need to know at least a few differences <3

The difference between Christianity and Islam is big. For Instance, Christians believe Jesus is the Son of God, the Missiah, or The King of Jews. The Islam's believe Jesus was not the Son of God but the Messenger of God. Christians use the Holy Bible while Islam's use the Qur'an. There are many other differences btween Christians and Islam's, but this is already a paragraph.