There were a lot of things he was discreet about. Notice during his trial, he was asked who he claimed to be, and did not answer. In restrospect, I think the writers of the gospel said a lot of "of course's!" to themselves, finally getting what Jesus was saying.
Read the story of the Last Supper, and
Matthew 26-27 (Mark 15:29 parallel )
He already had so many people hovering around him that he couldn't find privacy. If he declared that He was God, then people would just demand more of him, or think he was a lunatic. I would have walked away over that.
For me, the resurrection is not necessary. It would not have changed my faith much if it hadn't happened. The invitation to Heaven and redemption was based on an offer, and sacrificial giving. I see his resurrection as just a reassurance for the disciples that they were not imagining things. It is very discouraging to put your hope in a leader, then watch them go to trial and be hung. Especially before anything conclusive happened, like freedom from political oppression.
The sacrifice that Jesus made of his life has been compared to that of Abraham and Isaac. Abraham assumed that he had to give up what was so dear to him, in order to please God. God provided the scapegoat, because it was not His desire for Abraham to sacrifice Isaac -- for Abraham to live with the grief or guilt, and for Isaac to face unnecessary death.
Ge 22:8
Abraham said, "God will provide for Himself the lamb for the burnt offering."
Joh 1:29
The next day he saw Jesus coming to him and said, "Behold, the Lamb of God who takes away the sin of the world!
Re 14:4
These are the ones who follow the Lamb wherever He goes. These have been purchased from among men as first fruits to God and to the Lamb.
Jesus is often called the Lamb of God. The offering that covers all our sins.
The resurrection reassures us that even though he died, to take the place of us in death we deserved, that He has overcome death. The crucifixion was temporary suffering, well worth the trouble and agony.
Jesus is our scapegoat.
He gave himself as a sacrifice once, for all. Not just for those of us who are worthy, or have practiced religion our whole lives, but for all humanity.
Some related verses-
1Pe 3:18
For Christ also died for sins once for all, the just for the unjust, so that He might bring us to God, having been put to death in the flesh, but made alive in the Spirit.
Heb 10:10
Heb 9:12
Heb 7:27
Who does not need daily, like those high priests, to offer up sacrifices, first for His own sins and then for the sins of the people, because this He did once for all when He offered up Himself.
The criminal next to Jesus, also on a crucifixion cross, was not a devoted Jew or Christian. But he said,
"Jesus, remember me when You come in Your kingdom!"
Jesus responded,
"Truly I say to you, today you shall be with Me in Paradise." Lu 23:43
Jesus knew he had better things waiting on the other side. But he also wanted his death to cover anyone -- anyone who chose to be with him.