Redemption delivers the elect from the power of satan Acts 26:18
18 To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.
This is a deliverance from unbelief because unbelief is under the power of satan, as he blinds our minds ad hearts resulting in unbelief 2 Cor 4:3-4
3 But if our gospel be hid, it is hid to them that are lost:
4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them