Has the Gospel been presented to all? I don’t think so,
Have many died without hearing it? Yes.
Does every moral agent know and violate the law of God? yes.
We then see a difference between the law and the gospel. The law is universal and the gospel is not.
The law has a purpose: to expose sin and justify condemnation for sinners. The gospel has a purpose: To proclaim Jesus as both Lord and Savior and to be used by the Spirit to being faith and salvation to whomsoever He wills.
Since God has seen fit to bring a condemning law that is universal but a saving word that is limited, it is folly to think that God wants everyone saved. He wants no one to sin. But all do. That is their action, their choice. They react to truth with the lie; to righteousness with sin. They [everyone[ are justly condemned.
But God does not bring a saving word to everyone. That is His action, His choice. Now since that is His choice, whose sins did Jesus die for? Did He die for the sins of the people who God never chooses to present a saving word? What would be the point? At best one could say that Jesus died for the sins of only those who would hear the gospel. That would be a limited atonement.