I refer you to Al Mohler's blog on "The American Experience and the Death of Evangelism." During a class in Romans, specifically Romans 1, one of the students - a good church member for more than 2 decades - could not believe that God would allow those who never heard the gospel to suffer in hell. "That's not the way I think God is," was his rationale.
Mohler has hit the nail on the head. Modern evangelicals (if that term still means anything, according David Wells in The Courage to Be Protestant) struggle with this concept as pluralism creeps ever closer into our churches.