The problem with this reasoning is that it suggests God has some obligation to save people ...
I didn't say that, I was just discussing what his criterion is. He is in fact damning people for not believing in Jesus, because those are in fact the people he damns.
If he says "I'm going to damn all the people with original sin, unless they believe in Jesus", then since all people have original sin, he is in fact damning exactly and only those who don't believe in Jesus, so that's what they're going to Hell for.
We all deserve Hell, that's where you have to start.
Speak for yourself.
But you complain that those who refuse to give that little should not be damned even though the terms are very clear. As for those who never heard of Jesus, there are probably fewer these days than ever before thanks to missionaries, but if you like you could join in getting the word out so more might be saved.
Hey, predestination, remember? God has already decided who will be damned and who saved, and nothing we can do can interfere with his sovereign power of election. The number is fixed.