Why did Jesus get tortured by the Romans? Why did Jesus refuse to strike back but rather forgive them? Why did Jesus die and then got alive the third day?
Well because he knew if people kill the Son of God, the Humanity falls to Darkness. He didn't strike back because what type of God would that make him.
Instead he goes to sacrifice himself for the sake of Humanity Future, he forgave them and God gave them 2nd chance. And now he's sitting in heaven next to Father.
Christianity expanded quicly because we realized: Pain has the meaning. And of you try hard, you get rewarded.
Life isn't easy, so don't think Life should be good because Life is the obstacle to the Heaven.