From the Lutheran POV we say we know what God's Ordered Means are, Scripture tells us that God saves us through faith which He works and creates in us through the Means of Grace, Word and Sacrament. So that through the preaching of the Gospel, through Baptism, through the Lord's Supper God declares us forgiven on Christ's account, God freely justifies us through faith by imputing to us the righteousness of Jesus Christ. So that salvation is by grace alone through faith alone on Christ's account alone.
This leaves open a ton of questions for which we have no answers: What about children who die in the womb, or are stillborn, or unbaptized children who die, or people who never heard the Gospel, etc.
We don't have an answer to this. These questions touch upon God's Absolute Means, His Absolute Power. Speculation will always just be speculation, but Scripture bears witness to God's loving goodness, His grace, the super abundance of kindness which He has for us sinners in Christ. So, for example, it is written that God is "the Savior of all men, especially of those that believe".
We also can know that since salvation is found in no one else other than Christ, that whoever is saved is saved because of Christ.
So what about those who have not heard? We don't know and we can't say--but we do know that God is merciful, kind, just, and in all ways good. And so He who sent His Son to die for the world loves the world which He intends to save.
We know God's Ordered Means, but we don't know how, where, and in what ways God's Absolute Means are. If God ordains that this person over there who has never heard the name of Christ is, nevertheless, saved; it is not because they are saved in spite of Christ but because of Christ. However, whenever, wherever, and whyever is God's purview and not ours.
We preach Christ crucified and raised from the dead, in who alone and in whose name alone is salvation. We know what God has said and ordered His Church to do in order to bear the word of that salvation to the world. But we don't get to tell God that He is limited by His own Means. If God says, "I will save this person" then glory be to God, God's will be done.
This should fill us with hope, but not complacence. We do not get to say, "Since God can save everyone He so wills, then the preaching of the Gospel and administering of the Sacraments is unnecessary". God, by His absolute power and will made fire to not harm the companions of Daniel in the fiery furnace; that does not mean we can then say, "fire does not burn, so I should touch an open flame with my bare skin" because the heat of the fire will burn you--that's what fire does. The ordered power of God remains the ordered power of God even when His absolute power can do whatever He so wills.
-CryptoLutheran