They know what they know in that they have found redemption in Prophet Muhammad, directly with Allah Himself. There is no THE redeemer. He was a Redeemer.
Exactly then why they reject Jesus death and resurrection. No way can they reconcile with Christianity unless they realize what Jesus said and did.
430 Jesus means in Hebrew: “God saves.” At the annunciation, the angel Gabriel gave him the name Jesus as his proper name, which expresses both his identity and his mission.18 Since God alone can forgive sins, it is God who, in Jesus his eternal Son made man, “will save his people from their sins”.19 in Jesus, God recapitulates all of his history of salvation on behalf of men.
431 In the history of salvation God was not content to deliver Israel "out of the house of bondage"20 by bringing them out of Egypt. He also saves them from their sin. Because sin is always an offence against God, only he can forgive it.21 For this reason Israel, becoming more and more aware of the universality of sin, will no longer be able to seek salvation except by invoking the name of the Redeemer God.22
432 The name “Jesus” signifies that the very name of God is present in the person of his Son, made man for the universal and definitive redemption from sins. It is the divine name that alone brings salvation, and henceforth all can invoke his name, for Jesus united himself to all men through his Incarnation,23 so that "there is no other name under heaven given among men by which we must be saved."24
433 The name of the Savior God was invoked only once in the year by the high priest in atonement for the sins of Israel, after he had sprinkled the mercy seat in the Holy of Holies with the sacrificial blood. The mercy seat was the place of God’s presence.25 When St. Paul speaks of Jesus whom “God put forward as an expiation by his blood”, he means that in Christ’s humanity "God was in Christ reconciling the world to himself."26
434 Jesus’ Resurrection glorifies the name of the Savior God, for from that time on it is the name of Jesus that fully manifests the supreme power of the “name which is above every name”.27 The evil spirits fear his name; in his name his disciples perform miracles, for the Father grants all they ask in this name.28
435 The name of Jesus is at the heart of Christian prayer. All liturgical prayers conclude with the words “through our Lord Jesus Christ”. The Hail Mary reaches its high point in the words “blessed is the fruit of thy womb, Jesus.” The Eastern prayer of the heart, the Jesus Prayer, says: “Lord Jesus Christ, Son of God, have mercy on me, a sinner.” Many Christians, such as St. Joan of Arc, have died with the one word “Jesus” on their lips.
You can call the Jews the Chosen People but it’s not quite the same as stating that Moses was the greatest Prophet that ever lived which you would never state…
The Greatest Prophet isn’t God. Jesus is God.
John 5 : 36 “I have testimony weightier than that of John. For the works that the Father has given me to finish—the very works that I am doing—testify that the Father has sent me. 37 And the Father who sent me has himself testified concerning me. You have never heard his voice nor seen his form, 38 nor does his word dwell in you, for you do not believe the one he sent. 39 You study[c] the Scriptures diligently because you think that in them you have eternal life. These are the very Scriptures that testify about me, 40 yet you refuse to come to me to have life.
41 “I do not accept glory from human beings, 42 but I know you. I know that you do not have the love of God in your hearts. 43 I have come in my Father’s name, and you do not accept me; but if someone else comes in his own name, you will accept him. 44 How can you believe since you accept glory from one another but do not seek the glory that comes from the only God[d]?
45 “But do not think I will accuse you before the Father. Your accuser is Moses, on whom your hopes are set. 46 If you believed Moses, you would believe me, for he wrote about me. 47 But since you do not believe what he wrote, how are you going to believe what I say
MJ