People who never heard about Jesus' death and resurrection are still without excuse on Judgment Day. You should have read and taken to heart the Romans 1 passage:
Rom 1:18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth.
Rom 1:19 For what can be known about God is plain to them, because God has shown it to them.
Rom 1:20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.
Rom 1:21 For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. (ESV)
However, I believe that there will be degrees of just punishment for unbelievers, depending on the light that they had, as per the parable of the talents, for example.