Question: "What happens to those who have never heard about Jesus?"
Answer: All people are accountable to God whether or not they have "heard about Him." The Bible tells us that God has clearly revealed Himself in nature (Romans 1:20) and in the hearts of people (Ecclesiastes 3:11). The problem is that the human race is sinful; we all reject this knowledge of God and rebel against Him (Romans 1:21-23). If it were not for God's grace, we would be given over to the sinful desires of our hearts, allowing us to discover how useless and miserable life is apart from Him. He does this for those who continually reject Him (Romans 1:24-32).
In reality, it is not that some people have not heard about God. Rather, the problem is that they have rejected what they have heard and what is readily seen in nature. Deuteronomy 4:29 proclaims, "But if from there you seek the LORD your God, you will find him if you look for him with all your heart and with all your soul." This verse teaches an important principle—everyone who truly seeks after God will find Him. If a person truly desires to know God, God will make Himself known.
The problem is "there is no one who understands, no one who seeks God" (Romans 3:11). People reject the knowledge of God that is present in nature and in their own hearts, and instead decide to worship a "god" of their own creation. It is foolish to debate the fairness of God sending someone to hell who never had the opportunity to hear the gospel of Christ. People are responsible to God for what God has already revealed to them. The Bible says that people reject this knowledge, and therefore God is just in condemning them to hell.
Instead of debating the fate of those who have never heard, we, as Christians, should be doing our best to make sure they do hear. We are called to spread the gospel throughout the nations (Matthew 28:19-20; Acts 1:8). We know people reject the knowledge of God revealed in nature, and that must motivate us to proclaim the good news of salvation through Jesus Christ. Only by accepting God's grace through the Lord Jesus Christ can people be saved from their sins and rescued from an eternity apart from God.
If we assume that those who never hear the gospel are granted mercy from God, we lose our motivation for evangelism. We also run into a terrible problem. If people who never hear the gospel are automatically saved, then it is logical to make sure no one ever hears the gospel—because then there would be a chance they will reject it and be condemned.
The Bible is clear that those who perish without Christ will face an eternity in hell. Jesus’ mandate to evangelize the whole world is still in force. People need to call on the name of the Lord, but “how . . . can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? And how can anyone preach unless they are sent?” (Romans 10:14–15). Those who have never heard about Jesus Christ desperately need to hear, and that caused Paul to exclaim, “Woe to me if I do not preach the gospel!” (1 Corinthians 9:16).