“Remember ye not, that, when I was yet with you, I told you these things? And now ye know what withholdeth that he might be revealed in his time. For the mystery of iniquity doth already work: only He who now letteth will let, until He be taken out of the way.” 2 Thessalonians 2:5-7 (KJV)
It is not yet time for the “Son of perdition” to be revealed. Really, only God know when that time will be. When God removes the restraints, then and only then can this deceiver who is also the “Anti-christ” have a free hand.
That raises a question. Who or what is the restraint? Whoever or whatever it is must be the greatest power in all the Universe. He is like the wind; unseen, but you can hear Him at work; you can feel Him touch the cheeks of your soul; you hear His still, small, sweet voice, and you can see His effects upon the lives of people. I is a Person who is restraining. Yes! It is the Person of the Holy Spirit, the Spirit of God.
There is already, and has been since the garden of Eden; the working of iniquity. When the presence and power of the Holy Spirit is gone iniquity will have a free hand for a while. The Holy Spirit is present and powerful in the Church which is being sanctified by Him for the glory of Christ Jesus. Since Jesus said, “I will not leave you Comfortless” (John 14:18), then He will not leave the Church here without His Spirit (the Comforter). The restraining of the Holy Spirit will continue until the Church is stolen away from this earth, “As a thief in the night.”