Demons and the believer

[1ofthechosen]

So 2 Corinthians 4:4 NLT Says "4 Satan, who is the god of this world, has blinded the minds of those who don’t believe. They are unable to see the glorious light of the Good News. They don’t understand this message about the glory of Christ, who is the exact likeness of God"

Is this true or not and how can your rectify what your claiming and make it jazz with this? Not explain something else entirely but it all has to fit together, so give a teaching on this.