But by the bible's logic, God does punish the good. If I am 'good' my whole life, but do not believe, according to the bible I will go to hell. Yet a serial killer can repent, and go to heaven. Where is the justice in that?
& As for your last comment, no offense, but living your life around Occam's Razor is pretty moronic. By the same reasoning, you should live in a bubble and never go outside, just to be safe. Additionally, following a religion simply because you're scared of being punished/going to hell etc means you're not a true follower of said religion, and therefore you will go to hell/recieve punishment anyway. Yay for circular logic.
But on topic, I have asked the same question in the past. The general consensus from religious people who responded was that they would either enter limbo/purgatory, or be judged based on their actions, as they haven't denied God, they were simply unaware. It's the same problem with regard to the millions of people who lived before Christianity. If Christianity is the true religion, it came pretty fucking late.