Part of the process of problem-solving is identifying the nature of the problem. If the identification of the problem is wrong, the proposed solution won’t work.
Those who say that God will save those people who have never heard the gospel make the gospel the problem. What condemns is not the failure to hear, but human sin.
Thus I told you that you will die in your sins. For unless you believe that I am he, you will die in your sins.
John 8:24 NET
Jesus said that people will die in their sins. This means that sin is the problem of human beings. Without remission (removal) or forgiveness of sins, there is no salvation, and no one will receive eternal life.
Jesus is not the problem, but the solution.
As such, it behooves every Christian to speak to all about the Lord Jesus and how to believe in him.