No mention of the holy Spirit restraining, so do not include it.
2Th 2:6 And now ye know what withholdeth that he might be revealed in his time.
2Th 2:7 For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.
Satan is on a leash right now and can only influence the world so much.
But God has to end this sin business on earth one day so He has to allow the devil to deceive the world to rebel against God so He can put them down, which God will not give up on the world until the world gives up on Him.
If God did not let Satan off his leash then the world would never be wicked enough to rebel against God, so He is allowing the man of sin to deceive the people who do not love Him, which He is not forcing anybody to do it.
What this means is God is holding back the devil from having too much influence in the world until the world is at their worse, and then the devil will be off his leash concerning the wicked, and appear as the man of sin and deceive the wicked.
When the nations come together and work for peace on earth for three and one half years they stop the preaching of the Gospel of Christ, and the New Age Christ will push the agenda of the new age movement, and more people will accept it as time goes on, and the time that the world will not accept the truth of the Bible, but want to hear the Bible according to the new age movement.
At the end of the three and one half years the falling away first happened, when the transgressors are come to the full, and then a king of fierce countenance, and understanding dark sentences shall stand up, and his power shall be mighty, but not by his own power.
After the falling away first because the world stopped the preaching of the Gospel, and the world could not provide peace on earth, the world accepts the man of sin to solve their problems.
War breaks out in heaven and the devils are cast to earth, which the earth becomes the habitation of devils, and Satan appears as the man of sin, and the devil is off his leash concerning the wicked, and the devils deceive all people that do not love God to follow the beast, which is the strong delusion God will send everyone that does not love the truth.
The mystery of iniquity already works in the world which people are rebellious against the truth, and involved in sin, but God is retraining the devil from having too much influence in the world, and when the world is at it's worse in going against the truth then the man of sin shall claim to be God, and the devil is not restrained from appearing as the man of sin that shall deceive the world to rebel against God.
What withholds the man of sin from appearing is the condition of the world according to their sins, so when they stop the preaching of the truth for three and one half years world wide, then the devil will inhabit the man of sin and he will deceive the world.