If one considers what St. Pauls was saying, there really isn't any excuse because gentiles know what is expected of them morally under the natural law, and Jews were taught the Law through moses. In both instances, what is expected of a person regarding the law, whether by natural experience or by divine revelation is present. That is why there is no excuse for not knowing the law, for can know by conscience or actual knowledge whether something is right or wrong. Adam and Even knew it, and yet they were not given the Law, for the Law was not introduced until Moses. Therefore, From Adam until Moses, the law was there naturally.
There's probably at least half a billion left on the planet who are not Christian.
It would seem to me more arrogant to lay claim that you are assured that nearly half a billion of the world's population is going to Hell because they haven't read the Bible. Can you honestly say you know the mind of God on this matter? As far as I know, those not knowing Christ will be judged, but we don't know for certain what their final fate will be - nor do we know ours with absolute certainty. To proclaim that we do is real arrogance.
Yet, God still calls us sinners, despite how dispicable you see humanity. I'm sorry that you hate your fellow humans, especially that you would want to claim those you know nothing about the hellfire. God knows the heart, you don't.
Pax Tecum,
John