"Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain. For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures..." (emphasis added)
The man Jesus is God, or Christ, and because of this he could die in our place, to pay for our sins as the perfect sacrifice. He was buried but rose from the dead, showing he had defeated sin and death and that what he did and said through his life was true. Through this we can be saved from the judgement that we deserve.