In reply to your post THIS IS THE SINGLE GREATEST SIGN (fivedoves.com) I don't think that the Gog-Magog armies surrounding Jerusalem is the single greatest sign that the Rapture is about to happen because the Gog-Magog war in Ezekiel 38 does not take place until just prior to the 2nd coming of the Lord.  If you read Ezekiel 39:1-4, the Lord turns them back & leaves just the sixth part of them, & they fall on the mountains of Israel.  The Lord gives the fallen men unto the ravenous birds and beasts of the field to devour.  In Ezekiel 39:17-18 the Lord also tells every feathered fowl & beast that they will eat the flesh & blood of the fallen men until they are full.  This is also depicted in Rev. 19:17-18.

However, Jerusalem being compassed with armies in Luke 21:20-28 may very well be the armies of the Little Horn (crown prince) who is now king over a kingdom of 10 other kings who goes down to invade Israel to set up the abomination of desolation and sit inside the temple of God in Jerusalem and show himself that he is God. Daniel 11:41-45 shows him entering the glorious land (Israel) and many countries shall be overthrown including Egypt, Libya & Ethiopia. (Daniel 7:24 tells us that he shall subdue 3 kings.) And he plants the tabernacles of his palace between the seas in the glorious holy mountain (temple mount).   As you know the abomination of desolation takes place at the beginning of the Great Tribulation when those living in Judea are told to flee to the mountains when they see the abomination of desolation stand in the holy place.

So if our redemption draws nigh (Luke 21:28) at this point in time as the Rapture, that may very well fit with our gathering together by the Lord in 2 Thess. 2:1-4 when the man of sin is revealed when he sits in the temple of God showing himself that he is God.  If we are accounted worthy to escape all these things (Luke 21:36) & "Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell on the earth (Rev. 3:10) which I think means we wouldn't be tempted to take the mark of the Beast because we would be raptured to heaven.