The "unevangelized" question is one of the oldest in Christian thought. The biblical witness gives us several principles.
God is genuinely just
Abraham asks, "Shall not the Judge of all the earth do right?" (Genesis 18:25). The God of Scripture does not condemn anyone for being born in the wrong place at the wrong time. In Romans 2:14–16, St. Paul writes that those who never heard the law are judged "by the work of the law written on their hearts."
General revelation is real and accessible
The created order itself testifies to God (Romans 1:18–20). Every culture has wrestled with conscience, beauty, and the longing for transcendence. C. S. Lewis argued that the universal "longings for joy" across cultures, and the universal sense of right and wrong, are themselves a kind of preaching of God to every heart.
Christ is the Logos through whom every act of light comes
This is a deeply Orthodox emphasis (St. Justin Martyr, St. Maximus the Confessor): Christ is the eternal Logos in whom every truth participates. Whatever genuine goodness any person reaches by the light they have, they reach by Christ — even when they have not heard his name. This does not collapse Christianity into universalism; it dignifies it as the fulfillment of every honest search.
The question is not an objection — it is a charge
If God is truly just toward the unevangelized, the Church's task is not to despair of them but to bring them the fullness of the truth they have only glimpsed.