It delivers us from the power of darkness !
Col 1:12-14
12 Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light:
13 Who hath delivered us from the power of darkness [Unbelief], and hath translated us into the kingdom of his dear Son:
14 In whom we have redemption through his blood, even the forgiveness of sins:
Before one can Believe on the Lord Jesus Christ from the Gospel, deliverance from the power of darkness is imperative, because those who are under the power of darkness and the devil are in a lost state , and believe not the Gospel because the god of this world, while he still has power over them, blinds their minds to believe not the Gospel 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.
They believe not because they are under his blinding power in the mind.
Unbelief is but a symptom of being under the power and domain of satan and darkness, not delivered. Jesus said unbelief is because of the success of the devil here Lk 8:12
Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.
You see that ?
But when God delivers us first, its an translation out of one kingdom or power of darkness as Per 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[by faith] forgiveness of sins [Acts 10:43], and inheritance among them which are sanctified by faith that is in me.
God delivers them from the power of darkness into the Kingdom of His Dear Son, this by New Birth, then in the Kingdom of His Son Jn 3:3, we are made meet to believe the Gospel of that Kingdom.
Now who is it that shall be delivered from the power of darkness or of satan ? Its all those in Col 1:14
14 In whom we have redemption through his blood, even the forgiveness of sins:
That word redemption means:
a releasing effected by payment of ransom redemption, deliverance
liberation procured by the payment of a ransom
That's the deliverance of Col 1:13
13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
Yes, that's Right, Redemption that is in His Blood, delivers those it was shed for, from the power of darkness and unbelief !