The Bible doesn't say everyone who doesn't believe in Jesus goes to hell. If that were true, everyone on Earth before Jesus was born, would be going to hell. I also know God is just. A just God couldn't condemn people who have never heard of Jesus. Everyone knows right from wrong. The Bible says “But if from there you seek the LORD your God, you will find him if you look for him with all your heart and with all your soul.” I personally think that evidence of a creator is pretty obvious in nature. So, if you seek the creator, and live life as if God exists, I think you will be judged as a believer. It's the denial of the existence God or idol worship that's going to be a problem. I think there is scripture that backs the idea that the more you understand, the more you will be held accountable. "And that servant who knew his master’s will but did not get ready or act according to his will, will receive a severe beating. But the one who did not know, and did what deserved a beating, they will receive a light beating”. So those who know and understand the Gospel will be held to a much higher standard than someone living in the Amazon who has never heard of Jesus.