Jesus died for our sins, so that we borned sinners, have the potential to have our sins forgiven, and to live forever in heaven.

This is still a potential, due to our freewill.

If Jesus did accept the offer, and then never died for us. Every single human, despite your good works, would be cast into hellfire, for all eternity, as punishment for our sins, that could never be forgiven, or washed away by the blood and sacrifice of Jesus.

For proof, watch the two videos:
Thread: The Truth about the Afterlife. An Absolute must watch!