So there are two worlds?
1 Corinthians 11:27-32, " So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord. Everyone ought to examine themselves before they eat of the bread and drink from the cup. For those who eat and drink without discerning the body of Christ eat and drink judgment on themselves. That is why many among you are weak and sick, and a number of you have fallen asleep. But if we were more discerning with regard to ourselves, we would not come under such judgment. Nevertheless, when we are judged in this way by the Lord, we are being disciplined so that we will not be finally condemned with the world."
2 Corinthians 5:16-21, " So from now on we regard no one from a worldly point of view. Though we once regarded Christ in this way, we do so no longer. Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here! All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation: that God was reconciling the world to himself in Christ, not counting people’s sins against them. And he has committed to us the message of reconciliation. We are therefore Christ’s ambassadors, as though God were making his appeal through us. We implore you on Christ’s behalf: Be reconciled to God. God made him who had no sin to be sin for us, so that in him we might become the righteousness of God."
There is one world that Christ died for (that we know of!). Those in the (one) world who don't accept Christ as their Savior will be condemned; those who accept Christ as their Savior will not be condemned, as their sins will not be counted against them (us!). But we all live in the same world, the one that God created.
John 15:19 has the best explanation, "If you belonged to the world, it would love you as its own. As it is, you do not belong to the world, but I have chosen you out of the world. That is why the world hates you." Notice that "world" is singular.
1 Samuel 2:8, "He raises the poor from the dust and lifts the needy from the ash heap; he seats them with princes and has them inherit a throne of honor. “For the foundations of the earth are the Lord’s; on them he has set the world." [singular]