One thing we must keep in mind is that none of us know the mind of God. We think so rationally, yet His thoughts are so far beyond what we can comprehend. We tend to forget about His Grace and His Mercy. We concentrate so hard on figuring it all out, and our concepts of fair and unfair, we lose sight of the fact that we really don't know what's best. He does. And the children question has always been one that I've asked (also always wondered about people who never even had the chance, who were never exposed in any way shape or form to salvation as I believe it), but I've learned to trust in God, and I realise that there are somethings we will never know for sure as long as we are on this earth... I believe that we will be judged according to our understanding, and I believe in Mercy and Grace. I know I didn't really answer your question Nang, sorry.
"The greatest thing you'll ever learn is just to love and be loved in return."