I'm not sure if you're looking for a Christian only answer or what.. but hey..
Jesus was not necessary, Jesus IS the Messiah, PBUH, however, and he wil lreturn one day to set everyone straight, but for sins, we are all responsible for our own sins... for example, the OT clearly says that no man can EVER, by ANY means, redeem his brethren, and that we are all responsible for our own sins, so to say that Jesus died for anyone's sins, is not only untruer according to the OT Christians say they follow, it is in complete contradiction..
take a look..
"No man can by any means redeem his brother, or give to God a ransom for
him" (Psalms 49:7). - so how can Jesus have done exactly that when it is said right there i nthe Bible that it is IMPOSSIBLE?
in Islam, ofcourse, we believe him to be a great Prophet and Messenger, but no deity, the only way to rdemption is through God's mercy, not Jesus' blood, God forgives Whom He pleases, to say he can not forgive someone wh oasks for forgiveness is not only cruel, but also in contradiction with His Mercifull Being.
infact, Christians are so hardcore i ntherir belief that God can NOT forgive sins, that the Christian mainstream theology on ANYONE AND EVERYONE wh odied before Jesus, such as say Adam, Ibrahim, and Moses, PBUT all, according to modern Christianity, Moses, Ibrahim, and Adam, and all the other prophets who came before Jesus(pbut) all went to HELL after they died!, I'm dead serious! Christians believe the Prophet who brought mankind teh Torah went to hell after he died! because God didnt accept their repentance!
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[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]"And behold! Allah will say: ‘O Isa, son of Maryam was it you who said to the [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]people [/FONT][FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]"Take me and my[/SIZE] [SIZE=-1]mother for[/SIZE][/FONT] [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]two deities[/SIZE] [SIZE=-1]besides[/SIZE] [SIZE=-1]Allah?" He will say: "Glory to be to You! It is not fit[/SIZE] [SIZE=-1]for me to say[/SIZE][/FONT][FONT=Verdana, Arial, Helvetica, sans-serif] [SIZE=-1]what is not[/SIZE] [SIZE=-1]right for me (to[/SIZE] [SIZE=-1]utter). If I had said that, You would then[/SIZE] [SIZE=-1]have known it indeed.[/SIZE][/FONT] [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]You know[/SIZE] [SIZE=-1]what is in my mind,[/SIZE] [SIZE=-1]while I do not know what is[/SIZE] [SIZE=-1]in Your mind. Surely you are[/SIZE][/FONT] [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]the great[/SIZE] [SIZE=-1]Knower of hidden matter[/SIZE][/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]"I did not say to them anything except about what You had ordered me, namely,[/SIZE][/FONT] [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]"serve[/SIZE] [SIZE=-1]Allah, my[/SIZE] [SIZE=-1]Rabb and your Rabb" and I was witness over them so long as I[/SIZE][/FONT] [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]was with them,[/SIZE] [SIZE=-1]but when you[/SIZE] [SIZE=-1]caused me to die[/SIZE][SIZE=-1], You were Watcher over[/SIZE] [SIZE=-1]them.[/SIZE][/FONT][FONT=Verdana, Arial, Helvetica, sans-serif] [SIZE=-1]And You are a[/SIZE] [SIZE=-1]Witness over all things"[/SIZE][/FONT][/SIZE][/FONT]
-The Holy Quran[/SIZE]