If they're honest, they will happily admit that all none believers are going to Hell. I had a debate with one of my housemates (who is a devout Muslim) and he happily told me that I and all none Muslims were going to Hell.
I also asked him if God was so just and wise, why did he only instruct a few sand dwelling people from the same part of the world, condemning all his other creations to hell until centuries later when they might happen to hear his message? that was left unanswered![]()