“Atonement” is a theological word that gets mentioned. In short, atonement refers to the work that Christ has done for those who have faith in Him to earn their salvation.
I think people sometimes approach the gospel with skepticism. Jesus died for the sins of all who believe in him.
I know I used to ask was “why do we need this? Why do we have to believe in Jesus? Is sin such a big deal? Why is he the only way?”