"I declare unto you THE GOSPEL which I preached unto you, which also ye have received, and wherein ye stand" (1 Cor. 15.1) "by which also ye are saved" (v.2).

"Christ died for our sins according to the scriptures" (1 Cor. 15.3).

"And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world" (1 John 2.2).

"All we like sheep have gone astray; we have turned every one to his own way; and the LORD hath laid on him the iniquity of us all" (Is. 53.6).

Are there some people who have not gone astray? Of course not. Everyone has gone astray. "All we", "every one" so Jesus died for the "iniquity of us all."

If us and all are not everyone who ever lived that would be weird that God would point out only the sins of the elect and not the sins of everyone.

"Therefore as by the offence of one judgment came upon all men to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life" (Rom. 5.18). Everyone can have justification of life through Christ on the cross. All men are under condemnation. All men can be saved whosoever is willing.