Sorry Matt, I'll try to stay on topic better.
In 2 Thess, St. Paul foretells the takeover of the second temple by a messianic leader whose revolt is underway at the time of his writing:
"Let no one in any way deceive you, for it [the Day of Christ] will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of perdition, who opposes and exalts himself above every so-called god or object of worship, so that he takes his seat in the temple of God, displaying himself as god. Do you not remember that while I was still with you, I was telling you these things? And you know what restrains him now, so that in his time he will be revealed. For the mystery of lawlessness is already at work; only he who now restrains will do so until he is taken out of the way. Then that lawless one will be revealed" (2 Thess 2:3-8).
It is clear from the passage itself that St. Paul is referencing an event taking place in his day. The following points demonstrate that this passage was fulfilled by the temple takeover in Jerusalem during the Great Revolt of AD 66-70:
(1) St. Paul states that this false messianic person was already at work and that the Thessalonians knew firsthand what was keeping him from his eventual takeover of the temple of God. This necessarily places the passage's context and fulfillment in the first century.
(2) The passage is a reference to Matthew 24:15-16: "Therefore when you see the abomination of desolation which was spoken of through Daniel the prophet, standing in the holy place (let the reader understand), then those who are in Judea must flee to the mountains." It is important to recognize that St. Luke and the greatest Christian commentators down the centuries assign Matthew 24:15-16 to AD 66-70 (Cf. Luke 21:20-23 to Matt 24:15-20). Therefore, 2 Thess 2:3-8 also speaks of that messianic takeover of the Jerusalem Temple, which occurred during the Great Revolt of AD 66-70, just prior to the destruction of Jerusalem.
(3) The "falling away" of 2 Thess 2:3, the other key sign to be reckoned in tandem with this temple takeover, undoubtedly took place within one decade of St. Paul's writing. See: Book of Jude (all); 1 Jn 2:18-19/4:1-3; Acts 20:28-30; 2 Tim 1:15, 4:16; Heb 6:4-6/10:38-39. Scripture lists certain prominent apostates by name: Phygelus (2 Tim 1:15); Hermogenes (2 Tim 1:15); Demas (2 Tim 4:10); Alexander (2 Tim 4:14-16); Hymenaeus (2 Tim 2:17-18); Philetus (2 Tim 2:17-18); Diotrephes (3 Jn 1:9-11).
(4) St. Paul calls this temple the "Temple of God". The Second Temple was indeed the temple of God, as Jesus and the apostles all demonstrate by their example and teaching. In Matthew 24:15, Jesus calls this same event an abomination of desolation standing in the Holy Place. It is crucial to note that, after the destruction of the Temple at AD 70, no earthly stone temple can be considered the Temple of God. The proposition that there will be a future rebuilt "Temple of God" in Jerusalem is nowhere stated in the New Testament or anywhere else in scripture. In fact, such a future stone "Temple of God" with animal sacrifices and a pretender priesthood is made impossible by the entire teaching of the New Testament. New Covenant doctrine fully prohibits such a regression in redemptive history back to the Old Testament types and shadows. The destruction of Jersusalem at AD 70 caused the entire Temple economy of the Mosaic Covenant to become extinct from history.