Couldn't resist jumping in for a minute.
No, infants do not go to hell if they die. They go to heaven to be with the Lord.
Adults who have never heard of Jesus Christ are lost, and not through 'no fault of their own'. They are lost because of the same reason anyone else is lost: because they are sinners who cannot save themselves. God deals fairly and justly with everyone. He will not hold someone who never heard the gospel of Jesus Christ accountable for that gospel on their day of judgement. However, He will hold that person accountable for what knowledge and light he did have; what opportunities he had to act on that knowledge and light; and what actions that person actually took. It's laid out in Romans 2 for us. In other words, God holds people accountable for that which they do know.
Everyone, even the remotest pagan on the planet, has the light of (1) Creation, and (2) Conscience. Barring some mental handicap, every man is aware through Creation itself that a Higher Power exists. That is external revelation. Also, each man has a conscience, an inner guide to what is right or wrong (though it is not infallible). This is an internal witness to the fact that there is a moral order to the universe. Men instinctively know this. And every man, if he is honest, must admit that he has fallen short of even this standard many times - that is, he knows that in the course of his daily life he has often thought, said, and done things that contradict what he knows to be right and true. It is on this basis that God can rightly and justly condemn the man, for the man himself has demonstrated that he is a sinner, and moreover, that he has deliberately sinned, many times in his life.
Romans 10:13-15
for, "Everyone who calls on the name of the Lord will be saved." How, then, 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 they preach unless they are sent? As it is written, "How beautiful are the feet of those who bring good news!"
These are not my words. You should address your comment to a Mr. D. Longo, who presumed to speak for me.