Acts 17:30-31

The times of ignorance God overlooked, but now he commands all people everywhere to repent, because he has fixed a day on which he will judge the world in righteousness by a man whom he has appointed; and of this he has given assurance to all by raising him from the dead.

Christ's ressurection from the dead assures us of the truth of God's promise of righteous judgment for those who repent and believe. Our previous pagan ignorance, once overlooked by God, will no longer protect us.