Jesus in Islam

As an Abrahamic religion that post-dated Christianity, Islam holds that the traditions and prophets of Judaism and Christianity are their own, just as Christianity claims the traditions and prophets of Judaism as their own. This acceptance of the Christian tradition creates some conflicts, notably the fact that Christians consider Jesus to be the Son of God whereas this notion doesn't match with the teachings of the Qur'an. As such, Muslims do not believe that Jesus (translated as Isa in Arabic) is the Son of God and reject the notion of the Trinity, but do accept him as the most important prophet following Muhammad.

 "Oh People of the Book! Commit no excesses in your religion, 
 nor say of God anything but the truth. Christ Jesus, the son 
 of Mary, was (no more than) a messenger of God, and His Word 
 which He bestowed on Mary, and a spirit proceeding from Him. 
 So believe in God and His messengers. Say not, 'Trinity.' 
 Desist! It will be better for you, for God is One God, Glory 
 be to Him! (Far exalted is He) above having a son. To Him belong 
 all things in the heavens and on earth. And enough is God as a 
 Disposer of affairs" 

Despite the fact that Muslims do not consider Jesus to be the Son of God, they do hold that most of Jesus' life as described in the New Testament (translated as the Injeel in Arabic) is valid. As with Christianity, Muslims believe that Jesus was born from Mary who was a virgin.

 "Behold! the angels said, 'Oh Mary! God gives you glad 
 tidings of a Word from Him. His name will be Christ Jesus, 
 the son of Mary, held in honour in this world and the Hereafter, 
 and in (the company of) those nearest to God. He shall speak to 
 the people in childhood and in maturity.

 He shall be (in the company) of the righteous... And God will 
 teach him the Book and Wisdom, the Law and the Gospel'" 

Additionally, Muslims hold that the details of Jesus' life and ministry as related in the Gospel are truthful, but do not believe that he was crucified, and resurrected. Instead, they believe that he was ascended to heaven to save him from being crucified and another was instead made to appear to be Jesus and crucified in his place.

 They slew him not, nor did they crucify him but it was made
 dubious to them. 

Muslims also believe that Jesus foretold of Muhammad's eventual message and teachings.

 If you love me, Keep my commandments. And I will pray to the 
 Father and He shall give you another comforter that he may 
 abide with you forever.  

 But when the comforter is come, whom I will send unto you 
 from the Father, even the spirit of Truth, which proceedeth 
 from the Father, he shall testify of me, and he also shall 
 bear witness, because ye have been with me from the beginning.  

 I have yet many things to say unto you, but you cannot bear 
 them now. How be it when he, the spirit of Truth will come, 
 he will guide you into all truth, for he shall speak not of 
 himself, but whatsoever he shall hear, that he shall speak, 
 and he will show you things to come. He shall glorify me, 
 for he shall receive of mine, and he shall show it unto you.

Muslims believe that the "comforter" referred to by Jesus is Muhammad, although Christians hold the "comforter" to be the Holy Spirit.

Muslims also believe that Jesus will return to earth in the future, defeating an anti-Christ figure and fulfilling the prophecies of Isaiah.