Three choices are possible:
1. Christ died for some of the sins of all men.
2. Christ died for all the sins of some men.
3. Christ died for all the sins of all men.
No one says that the first is true, for then all would be lost because of the sins that Christ did not die for. The only way to be saved from sin is for Christ to cover it with His blood.
The third statement is what the non-Calvinist would say: Christ died for all the sins of all men. But then why are not all saved? They answer, Because some do not believe. But is this unbelief not one of the sins for which Christ died?
If they say yes, then why is unbelief not covered by the blood of Jesus and all unbelievers saved? If they say no (unbelief is not a sin that Christ has died for) then they must say that men can be saved without having all their sins atoned for by Jesus, or...
...they must join us in affirming statement number two: Christ died for all the sins of some men. That is, he died for the unbelief of the elect so that God's punitive wrath is appeased toward them and His grace is free to draw them irresistibly out of darkness into His marvelous light.
AMR
The 3rd choice is the correct choice AMR. Christ died for the sins of
all mankind. Making it possible for all men to come to Christ. However,
not all men will choose to place their faith in the Lord
Jesus Christ. God's Grace is available to all. It's a matter of choice.
I'm aware that Calvinists don't believe that men have a free will. I
happen to disagree. My reason is, the Bible makes it abundantly
clear. I have no doubt. I first heard the Grace Gospel in 1962 and
have trusted my soul to it since. I'm 65 years old today. I was 12
when I first heard Paul's Gospel. (The Grace Gospel)