Just so you know, Brethren in Christ that are interested...
The doctrine of men idea that the "temple of God" phrase which Apostle Paul used below is about Christ's spiritual temple, has a certain purpose in those men's false doctrines...
2 Thess 2:3-4
3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
KJV
Apostle Paul is pointing directly to a certain false one there that is to come, and sit in that "temple of God", proclaiming himself as God, and over all that is even called God, or that is worshiped.
That false one represents the pseudo-Christ that Lord Jesus warned is to come at the end of this world, per the Matthew 24:23-26 Scripture. It is the "another beast", the 2nd beast of Revelation 13 that Apostle John warned will work those great signs and miracles, and even raining fire down from heaven to the earth in sight of men.
Now we KNOW... Christ's spiritual temple CANNOT be that "temple of God" Paul is pointing to, because Christ is the Chief Cornerstone of the spiritual temple idea, of which His Apostles and prophets make up the base foundation, and those who remain faithful in Christ as lively stones in it. If that spiritual temple could be corrupted, then it would mean Christ Jesus Himself could be corrupted! And who would propose such an idea? A devil crept in unawares among those deceived that believe such a LIE.
The "temple of God" Paul was pointing is about a NEW PHYSICAL TEMPLE FOR THE END of this world built by the orthodox unbelieving JEWS, in TODAY'S JERUSALEM, on earth. Those Jews already have the materials ready to build it! And when the prophesied pseudo-Messiah shows up, well just you wait and see!
So WHO would try to and 'change' Paul's prophecy about that for the end? Here are some possibilities...
1. those still on the old doctrines of the Protestant Reformation. They believe the Antichrist for the end is about a Catholic Pope. So they treat that "temple of God" as the spiritual temple, with a Pope sitting over Christ's Church for the end, working falseness. But no, that Scripture ain't about no Pope. Their idea is a doctrine of men, not God's Word.
2. Jews who see no more need for a physical temple, so they are against any idea that God's Word points to another Jewish temple being built for the end. Those Jews simply are deceived about God's Word, not really heeding His Word on that. Thus theirs is another doctrine of men.
3. The "synagogue of Satan". They have every reason to try and change that "temple of God" into the spiritual temple idea, simply because they KNOW their king (the dragon) is coming to sit in that new Jewish temple to play Messiah, and thus deceive the whole world (except us, Christ's elect - see Rev.13:4-8)! So they do not want anyone understanding that Paul was pointing to an actual new physical temple built for the end of this world. Theirs is an actual doctrine from the devil himself.
BIBLICAL FACTS ABOUT IT:
1. in order to fulfill the "abomination of desolation" Jesus quoted from the Book of Daniel for the end of this world, it requires... a standing Jewish temple in Jerusalem for the abomination idol to be setup in (see end of Rev.13 about that idol).
2. in order for the coming pseudo-Messiah (as the "vile person") to create the "league" of Daniel 11, the old covenant must be started up again with animal sacrifices, and that also requires a temple to do those sacrifices with.
3. in order for that coming pseudo-Messiah to end... the daily sacrifice per the Daniel 11 Scripture, that old covenant for the orthodox Jews must be in place in Jerusalem again.
4. in Revelation 11:1-2, John is shown those who worship inside the temple, and it shows that it is a physical temple on earth, because the Gentiles are given its outer courts, and to tread the holy city Jerusalem for 42 months. And that happens within the 6th Trumpet - 2nd Woe timing. Jesus comes after that on the 7th Trumpet per that same Chapter. Thus a new third temple IS... to be built for the end of this world, for the coming "great tribulation".