I wrote previously regarding Old Testament saints and how they were saved by placing their trust in God. But what of those people groups in distant lands who never heard of Jesus or even the Old Testament patriarchs? Isn't it unfair for God to expect that they place their faith in some one they never heard of?
The Apostle Paul made it quite clear to the Epicureans and Stoics that every group of people had enough information to know that God exists. One proof of this is humanity's propensity to worship. The Athenians even had an altar to an unknown god, just in case they missed a deity who would be offended by being overlooked.
Read what Luke recorded in Acts 17:26-27 (Bible in Basic English). "And he has made of one blood all the nations of men living on all the face of the earth, ordering their times and the limits of their lands, So that they might make search for God, in order, if possible, to get knowledge of him and make discovery of him, though he is not far from every one of us:"
Since this is so, everybody has the light of conscience. Creation also demonstrates that it was designed by an astonishingly wise creator. Psalm 19:1-3 declares, ""The heavens are sounding the glory of God; the arch of the sky makes clear the work of his hands. Day after day it sends out its word, and night after night it gives knowledge. There are no words or language; their voice makes no sound."
Therefore, people are without an excuse. As Paul noted in Acts 17:30-31, "Those times when men had no knowledge were overlooked by God; but now he gives orders to all men in every place to undergo a change of heart: Because a day has been fixed in which all the world will be judged in righteousness by the man who has been marked out by him for this work; of which he has given a sign to all men by giving him back from the dead. By "know knowledge," Paul meant scriptural revelation.
In light of what these verses teach, I'm writing a book called You Think You're Going to Heaven? This is THEE most important question facing humanity and there's no going back after death to do life over again. I'm currently writing chapter two and hope to get it finished soon.