"4 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 being God."Did this event already happen in 70 AD at the destruction of the temple or is this still in the future?
This has been gone over before. One of Paul's metaphor for the church is as the temple. The picture is not of a Romanian creep taking up residence in a reconstructed temple building at the end of time, but of an arch-deceiver arising in the midst of the church. IMHO, yet future.
An arch-deceiver arising in the midst of the church??? A scoffer perhaps ala II Peter 3? a preterist scoffing at the prophecies of the return of Jesus to the land of Israel?
That's not future -- it's a present reality within and without the church.