In Arabic-speaking cultures, two words are commonly used for Christians: Nasrani , plural "Nasara" is generally understood to be derived from Nazareth through the Syriac (Aramaic); Masihi means followers of the Messiah.
Where there is a distinction, Nasranirefers to people from a Christian culture and Masihi means those with a religious faith in Jesus. (ref: Wikipedia.com)
And in Arabic, Jews are referred to as Yahudi Plural Yahud .
For Jews and Christians together, the term Ahlal-Kitaab meaning People of the Bookis often used in reference to the fact that the Jews and Christians possess The Bible.
Muslims refer to Christians as "Ahl al-Kitab" which translates to "People of the Book" in Arabic.
Muslims use it to refer to Christians and their bible.
Muslims consider anyone who does not believe in their way an "infidel". Infidel means unbeliever. The term was also used by Christians in the Crusades to refer to Muslims.
Hostility dates back to the Crusade wars against Muslims when Christians invaded Muslim lands on the claim of restoring holy lands. Refer to related questions below.
christians
The Shiah Muslims are a division of Muslims, something like protestant and Catholics, both are Christians.
An infidel is simply someone who believes in a religion (or nonreligion) different than you do. Muslims use the term infidel to refer to Non-Muslims. Christians use the term infidel to refer to Non-Christians.
Muslims go to Mosques and Christians go to churches.
Arab Muslims as well as Arab Christians fought together the crusaders as invaders and not as Christians.
The crows. 1st-Christians 2nd-Muslims 3rd-Christians (somewhat) 4th-Muslims (Christians fighting Christians = Muslim victory) 5th-Muslims 6th-Muslims 7th-Muslims 8th-Muslims 9th-Not much of a crusade and many don't consider it one, nothing really accomplished.
The crows. 1st-Christians 2nd-Muslims 3rd-Christians (somewhat) 4th-Muslims (Christians fighting Christians = Muslim victory) 5th-Muslims 6th-Muslims 7th-Muslims 8th-Muslims 9th-Not much of a crusade and many don't consider it one, nothing really accomplished.
They disagree with some Christian views and agree with them on other views. Refer to question below for more information.