Christ Redeems those He died for from the Prison of Unbelief !
Titus 2:14
14 Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
To be redeemed from all iniquity does include being redeemed from unbelief, the prison of unbelief. It should be remembered that to be in unbelief/disobedience is a matter of being imprisoned, for it is written in Rom 11:32
32 For God hath concluded them all in unbelief, that he might have mercy upon all.
To be concluded in unbelief is to be imprisoned to it. The greek word concluded is sygkleiō and means:
I.to shut up together, enclose
A.of a shoal of fishes in a net
II.to shut up on all sides, shut up completely
Man by nature is Locked up in Unbelief / disobedience !
Rom 11:32
32 For God has made all people prisoners of disobedience, so that he might show mercy to them all.GNT
32 For God has imprisoned all in disobedience, so that He may have mercy on all.HCSB
This is important to know, and this is why its impossible for any sinner by nature to believe and or obey, to say they can, is to say they overcame in their flesh being imprisoned to unbelief, which means they redeemed themselves out of the prison of unbelief and not Christ, is to usurp that prerogative from Christ !