Jesus: Died for our sins?

Did Jesus die for our sins? Is this even necessary according to the Bible? What did the early Christians say?
First, sacrifices ARE NOT the way sins are forgiven: sins are forgiven through sincere repentance (teshuva), prayer (tefilah), and deeds of charity (tzedakah).
Prayer:
2 Chronicles 6:21 And hearken Thou to the supplications of Thy servant, and of Thy people Israel, when they shall pray toward this place; yea, hear Thou from Thy dwelling-place, even from heaven; and when Thou hearest, forgive. 22 If a man sin against his neighbour, and an oath be exacted of him to cause him to swear, and he come and swear before Thine altar in this house; 23 then hear Thou from heaven, and do, and judge Thy servants, requiting the wicked, to bring his way upon his own head; and justifying the righteous, to give him according to his righteousness. 
Repentance:
Psalm 51:18 For Thou delightest not in sacrifice, else would I give it; Thou hast no pleasure in burnt-offering. 19 The sacrifices of God are a broken spirit; a broken and a contrite heart, O God, Thou wilt not despise.
Second, God DESPISES offerings that are not accompanied by these three things:
Isaiah 1:11 To what purpose is the multitude of your sacrifices unto Me? saith the LORD; I am full of the burnt-offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he-goats. 12 When ye come to appear before Me, who hath required this at your hand, to trample My courts? 13 Bring no more vain oblations; it is an offering of abomination unto Me; new moon and sabbath, the holding of convocations--I cannot endure iniquity along with the solemn assembly. 14 Your new moons and your appointed seasons My soul hateth; they are a burden unto Me; I am weary to bear them. 15 And when ye spread forth your hands, I will hide Mine eyes from you; yea, when ye make many prayers, I will not hear; your hands are full of blood. 16 Wash you, make you clean, put away the evil of your doings from before Mine eyes, cease to do evil; 17 Learn to do well; seek justice, relieve the oppressed, judge the fatherless, plead for the widow.

Psalm 40:7 Sacrifice and meal-offering Thou hast no delight in; mine ears hast Thou opened; 

burnt-offering and sin-offering hast Thou not required.
8 Then said I: 'Lo, I am come with the roll of a book which is prescribed for me;
9 I delight to do Thy will, O my God; yea, Thy law is in my inmost parts.'

Malachi 1:10 Oh that there were even one among you that would shut the doors, that ye might not kindle fire on Mine altar in vain! I have no pleasure in you, saith the LORD of hosts, neither will I accept an offering at your hand. 

Etc.

So, even IF Jesus had died for our sins, it is not his death, nor his resurrection, nor belief in him that would grant the forgiveness of God. God despises sin offerings that are not offered with sincere repentance, prayer, and deeds of charity, and it is these things that make God forgive a person, not the sin offering. The sin offering is only an outward sign of an inward change that has already occurred. 

Thirdly, many early Christians did not believe Jesus had actually died. 

I did not succumb to them as they had planned. But I was not afflicted at all. Those who were there punished me. And I did not die in reality but in appearance, lest I be put to shame by them because these are my kinsfolk. I removed the shame from me and I did not become fainthearted in the face of what happened to me at their hands. I was about to succumb to fear, and I suffered according to their sight and thought, in order that they may never find any word to speak about them. For my death, which they think happened, (happened) to them in their error and blindness, since they nailed their man unto their death. For their Ennoias did not see me, for they were deaf and blind. But in doing these things, they condemn themselves. Yes, they saw me; they punished me. It was another, their father, who drank the gall and the vinegar; it was not I. They struck me with the reed; it was another, Simon, who bore the cross on his shoulder. It was another upon Whom they placed the crown of thorns. But I was rejoicing in the height over all the wealth of the archons and the offspring of their error, of their empty glory. And I was laughing at their ignorance. (The Treatise of the Great Seth) 

When the soldiers with Judas drew near to the place where Jesus was, Jesus heard the approach of many people, wherefore in fear he withdrew into the house. And the eleven were sleeping. Then God, seeing the danger of his servant, commanded Gabriel;, Michael;, Rafael;, and Uriel, his ministers, to take Jesus out of the world. The holy angels came and took Jesus out by the window that looks toward the South;. They bare him and placed him in the third heaven in the company of angels blessing God for evermore.

Judas entered impetuously before all into the chamber whence Jesus had been taken up. And the disciples were sleeping. Whereupon the wonderful God acted wonderfully, insomuch that Judas was so changed in speech and in face to be like Jesus that we believed him to be Jesus. And he, having awakened us, was seeking where the Master was. Whereupon we marvelled, and answered: 'You, Lord, are our master; have you now forgotten us?'  

And he, smiling, said: 'Now are you foolish, that know not me to be Judas Iscariot!' And as he was saying this the soldiery entered, and laid their hands upon Judas, because he was in every way like to Jesus. We having heard Judas' saying, and seeing the multitude of soldiers, fled as beside ourselves. And John, who was wrapped in a linen cloth, awoke and fled, and when a soldier seized him by the linen cloth he left the linen cloth and fled naked. For God heard the prayer of Jesus, and saved the eleven from evil. (The Gospel of Barnabas)

In conclusion, Jesus did not need to die for our sins; and even if he had, believing in him would not grant forgiveness of sins.