Appended to that Jonah article we blogged about yesterday was another tidbit from Ronald F. Marshall explaining why Islam denies that Jesus was crucified:
According to the Koran, Jesus was not crucified on the cross. Some have it that he never was nailed to the cross but a look-alike was nailed there in his place, perhaps Thomas or Judas; others that he was nailed to the cross but was taken down and later resuscitated in the tomb.
On this view, the sign of Jonah (Matt. 12:39; Luke 11:29) says that Jesus will not die because Jonah did not die in the belly of the whale, and that alone is the true but forgotten point of comparison between Jesus and Jonah. This argument is made by Ahmed Deedat in Was Jesus Crucified?, published by the Library of Islam.
Islam denies the Atonement for two reasons. First, “the Christian concept of salvation presupposes the existence of an a-priori state of sinfulness, which is justified in Christianity by the doctrine of ‘original sin,’ but is not justified in Islam, which does not subscribe to this doctrine,” as one highly esteemed Koranic scholar, Muhammad Asad, put it.