So the elect from amongst the jews and gentiles, for their unbelief, they obtain mercy Rom 11:30-32
30 For as ye in times past have not believed God, yet have now obtained mercy through their unbelief:
31 Even so have these also now not believed, that through your mercy they also may obtain mercy.
32 For God hath concluded them all[elect jew/gentile] in unbelief, that he might have mercy upon all.
Paul was one of the elect jews who through his unbelief obtained mercy 1 Tim 1:12-13
12 And I thank Christ Jesus our Lord, who hath enabled me, for that he counted me faithful, putting me into the ministry;
13 Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief.
See God could have condemned Paul to hell while in unbelief as He Justly does to others Rom 11:20
20 Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
Jn 3:18
18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
So clearly all are not cut off, rejected of God because of their unbelief ! Some obtain mercy instead of Justice ! 3