Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ: (2 Peter 1:1 KJV)
Peter addresses his second epistle to those who have "obtained like precious faith--through the righteousness of God and our Saviour Jesus Christ."
Note that the righteousness of man is absent. Many try to claim they are Christians because of what they have done to merit favor with God.
They have helped the poor. They have lit candles and paid indulgences. They have been baptized. They have attended the temple ceremony. They have done church callings. They have gone on mission trips. They have been moral. They were raised in a Christian family. They attend church regularly. They read the Bible. They pray. They tithe to the church. They don't drink, smoke, dance or go with the girls who do. And the list goes on and on.
But Peter says nothing about all of this. He says these people have obtained precious faith through the righteousness of God and our Saviour Jesus Christ. It's all of God. Our own righteousness contributes nothing to saving faith.