What is the Catholic interpretation of 2 Thessalonians 2:3? The English translation of 2 Thes. 2:3 according to New American Bible, Revised Edition:


  3 Let no one deceive you in any way. For unless the apostasy comes first and the lawless one is revealed, the one doomed to perdition, NAB, 2011


The Greek text of 2 Thes. 2:3 according to the Textus Receptus states,


  Γ μή τις ὑμᾶς ἐξαπατήσῃ κατὰ μηδένα τρόπον ὅτι ἐὰν μὴ ἔλθῃ ἡ ἀποστασία πρῶτον καὶ ἀποκαλυφθῇ ὁ ἄνθρωπος τῆς ἁμαρτίας, ὁ υἱὸς τῆς ἀπωλείας TR, 1550


For the purpose of this question which requests an answer from Catholics, let us assume Catholicism represents the true Christian faith. 


Has the “the apostasy” (ἡ ἀποστασία) already occurred? If so, what is it, and when did it occur? 
If not, what criteria would the Pope and magisterium use to identify the apostasy when it occurs?
Has “the man of sin, the son of perditionÌ (ὁ ἄνθρωπος τῆς ἁμαρτίας, ὁ υἱὸς τῆς ἀπωλείας) been revealed? If so, who is he, and when was he revealed?
If not, again, what criteria would the Pope and magisterium use to identify this individual when he is revealed?


Note: The text seems to imply that “the apostasy” is not simply one individual’s apostasy, as individuals have been apostasizing since the beginning of the Church. Rather, it appears more evident, easily discernable, not en masse, but certainly more than a handful of individuals apostasizing from the Catholic Church (assuming the Catholic Church is the Church, the body of Christ).
The commentary on 2 Thessalonians 2:4 (that Antichrist &quot;sitteth in the temple of God&quot;) of the very anti-Protestant Original Douay-Rheims Bible says:

St. Augustine therefore li. 20 de civit. c. 19 and St. Jerome q. 11 ad Algasiam. do think, that this sitting of Antichrist in the temple, doth signify his sitting in the Church of Christ, rather than in Solomon's temple. Not as though he should be a chief member of the Church of Christ, or a special part of his body mystical, and be Antichrist and yet withal continuing within the Church of Christ, as the Heretics feign, to make the Pope Antichrist (whereby they plainly confess and agnise [recognize] that the Pope is a member of the Church, &amp; in ipso sinu Ecclesia, and in the very bosom of the Church, say they:) for that is ridiculous, that all Heretics whom St. John calleth Antichrists as his precursors, should go out of the Church, and the great Antichrist himself should be of the Church, and in the Church, and continue in the same. And yet to them that make the whole Church in revolt from God, this is no absurdity. But the truth is, that this Antichristian revolt here spoken of, is from the Catholic Church: and Antichrist, if he ever were of or in the Church, shall be an Apostate and a renegade out of the Church, and he shall usurp upon it by tyranny, and by challenging worship, religion, and government thereof, so that himself shall be adored in all the Churches of the world which he list to leave standing for his honor. And this is to sit in the temple or against the Temple of God, as some interpret. If any Pope did ever this, or shall do, then let the Adversaries call him Antichrist.

This passage makes it clear that a true pope cannot be Antichrist, but Antichrist will be an anti-pope, and anti-popes are not members of the Church.

Cardinal Manning, the most prominent father at the First Vatican Council who was responsible for the definition on papal infallibility, said in his Temporal Power of the Vicar of Christ 2nd part (4 lectures), &quot;The Perpetual Conflict of the Vicar of Christ&quot;, pp. 81-173 (available in printed form from TradiBooks as The Pope and The Antichrist):

We have here [2 Thessalonians 2:3-11] a prophecy … of a [spiritual*] revolt, which shall precede the second coming of our Lord … The authority, then, from which the revolt is to take place is that of the kingdom of God on earth, prophesied by Daniel [cf. Daniel 2] as the kingdom which the God of heaven should set up … in other words, the one and universal Church, founded by our Divine Lord, and spread by His Apostles throughout the world. In this one only kingdom was deposited the true and supernatural pure theism, or knowledge of God, and the true and only faith of God incarnate, with the doctrines and laws of grace. This, then, is the authority from which the revolt is to be made, be that revolt what it may.


[*&quot;St. Jerome, with some others, interprets this revolt to be the rebellion of the nations or provinces against the Roman Empire. … They have revolted, and no manifestation has appeared.&quot; Thus, the revolt is spiritual, not temporal.]