When Jesus Christ died for our sins and rose triumphantly from the dead, he provided the resolution to the problem of evil.
Some will say, how can you say he resolved the problem of evil, when there is still so much evil in the world?
Consider this analogy. When the covid-19 pandemic came, several companies rushed to develop effective vaccines. It might be said that those companies which developed effective vaccines provided the resolution to the problem of the pandemic. To be sure, the pandemic itself will not subside until the vaccine is manufactured, distributed and administered. And even then, some will not receive the vaccine. Nevertheless, once an effective vaccine was produced, there was a solution to the problem of the pandemic. To be sure, the remedy only works when it is received.
In the same way Jesus has provided the resolution to the problem of evil through his life, death and resurrection. The problem of evil is threefold. Traditionally, it is defined in terms of the Devil, the world and the flesh.
Satan is the origin of evil. He tempted our first parents to succumb to “the lust of the eye, the lust of the flesh and the pride of life” ( Genesis 3:4-7, I John 2:16) However, when he presented these same temptations to Jesus in the desert, he was consistently defeated (Matthew 4:1-11). And this was only the prelude to the greater defeats to come. When Satan inspired Judas to betray Jesus (Luke 22:1-6), he was unwittingly participating in his own ultimate destruction and in the eventual fall of his kingdom of darkness.
A second dimension of evil is what the Bible calls “the world.” This is not the created order, but the corrupt world system ruled by the evil one. But this kingdom of darkness is doomed to destruction along with its ruler (Revelation 20:10, 11:15).
Finally, the problem of evil is manifest in fallen humanity and in the wrong things we do. But through the gospel, Christ has dealt decisively to redeem all who will come to him, and to pay in full the penalty for their sins (I John 3:2, I Corinthians 15:3).
Christ has provided for the resolution of the problem of evil, and at the time of his return he will consummate his great redemptive plan for this world and finally resolve the problem of evil forever (Revelation 20-22).
Related: Glory Revealed, Honor Vindicated, Evil Conquered, Sinners Saved