It is a mystery that has eluded the very best of logicians. Even the most blissful of Christians has to deal with this, eventually. It is, as Mr. Spock would say, illogical. Yet it is precisely this belief that God is good and is working for good in a world full of evil that is core to the Christian's belief. And there are so many signs of goodness, and even of a good God, that an honest non-believer has to deal with it eventually.
Forgiveness is illogical.
It is also available. The appearances of gods have been said to provoke awe, quivering, total fear, and falling as if dead, preceded by earthquakes and thunderstorms. Christian tradition is founded on Jesus Christ, as described and told about in the New Testament. The core tradition is fixed. It's called the 'apostolic tradition' because it is the story of Jesus that the apostles, His closest associates, handed down to us.