The man of sin is the Culmination or fulfilment of man without God
He is the inevitable outcome of the rebellion against the gospel of christ
The refusal of man to receive the truth of the gospel
This un regenerated man will be used by satan
To deceive the elect
He will set up a church that teaches a counterfeit God
A counterfeit christ
And his power of his fake kingdom will come from the roman empire
The papacy is the fulfilment of the refusal of men to accept the gospel of christ, so the man of of sin , which in itself speaks of man in sin, will produce this prime example of man in sin
The man of sin. Will be a pope thefore.

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.