Your presumption (unbacked by scripture) is that the "short time" of Revelation 12:12 is at the end of 6,000 years. That's not what Rev. 12:12 says. John wrote to THAT generation, warning them, "Woe to the inhabiters of the earth and of the sea! For the devil IS COME DOWN UNTO YOU, having great wrath, because he knoweth that he hath but a SHORT TIME." If we pay attention to the present tense in which John was writing, then the devil RIGHT THEN in John's days was operating on earth, knowing that he had only THAT SHORT TIME left in which to operate. Are you saying that in John's days of writing Revelation that almost 6,000 years of history had elapsed? This is an honest question, since there are many and varied theories as to how long mankind has inhabited the planet, and I don't know where you stand on this issue.
As for the "little season" following the millennium in Rev. 20:3 when Satan is loosed, (which you do not agree is the same as the "short time" of Rev. 12:12), we are told quite plainly in Revelation 20:5 that the millennium is "finished", at the same time when the "First Resurrection" occurred, with the "remnant of the dead" coming to life again.
Christ and the Matthew 27 Firstfruits saints (aka the "remnant") composed the "FIRST resurrection" in AD 33. That means the "little season" of Satan being loosed (JUST AFTER the millennium had expired) BEGAN just after the AD 33 First resurrection occurred.
Of course, all this is dependent upon correctly identifying what the "FIRST resurrection" is. If you can't recognize that Christ raising Himself and the Matthew 27 saints from the dead was the event called the "FIRST resurrection", then we are at an impasse.
The first resurrection is a type, not a when. We are at an impasse. The Two types of reality is physical and spiritual. To God and in the beginning there was no separation of the physical and spiritual. Both existed together in harmony.
It is Adam's offspring who are "in the dark", both physically and spiritually. But the first birth. First death, and first resurrection deal with the physical. One has to be born physically or they do not even exist, so the physical comes first.
That which is born of the flesh is flesh, that which is born of the spirit is spirit. This body is in the image of Adam born in sin with a sin nature. This body has to be left behind as death, dust, and decay. The permanent body God originally gave to Adam is given at the first resurrection when the soul leaves this body for the permanent incorruptible body in Paradise. Made by God, not through the genetic copying of DNA from Adam. Blessed are all those from the Cross, and ongoing, until the Second Coming, with this first resurrection. The Second Death can never be a reality for them at that point. Those is Paradise cannot rebel and turn from God. They are permanently set with a physical body.
Those who died in faith prior to the Cross had to wait for that physical, first resurrection in Abraham's bosom. At the Cross they bodily were raised and ascended with Christ right after Jesus told Mary, He was about to ascend. That was the first "rapture", that Paul declared as "Christ the firsfruits". They are now sitting in Paradise enjoying their physical home. 2 Corinthians 5.
The resurrection in Revelation 20:4 is not the same one at the Cross. It is not even a rapture to Paradise. It is prior to the 1000 years, because it clearly states there is 1000 years between this first resurrection, and the GWT at the end of the 1000 years. It is physical to permanent incorruptible bodies because it is a first resurrection. Solely about the physical aspect of living.
From when Adam disobeyed God until now has been 5991 years. Satan unlocks the pit soon, in the 5th Trumpet. In the 7th Trumpet Satan and those loosed angels are kicked out of heaven. They only have 42 months left at that point. The time is short because 42 months compared to Satan working freely for 5991 years is definitely short.
At the end of those 42 months, those angels have been destroyed. Satan is then bound, and now we have the Sabbath Millennium, set aside without Satan, and sin, and death because of sin and decay. Those resurrected in Revelation 20:4 cannot die physically nor spiritually ever again. Their offspring can never die physically because of sin. They can, under the iron rod of Christ be sent to Death, which is permanent because of rebellion. Rebellion and disobedience will not be a means to allow sin back into the world. But neither will those in rebellion be allowed to live on earth, in disobedience. Instead of life being easy to sin and hard to obey, life will be easy to obey, but hard to rebel. That is why Satan is loosed at the end to give all who will, a chance to reject God freely. From the chapter, obviously many do act on their free will, and are consumed with fire by God in accordance with their choice.
No, the first century was not year 6000. It was year 4000. Adam's punishment was only for 6 days/millennia. That is why it is the end of life as we know it and Satan has only a short time. It is incredulous to think we should have been in the 7th Millennium 1900 years ago.
God gave 2000 years to the nations. 2000 years to the children of Abraham. 2000 years to a wild gentile branch grafted into the body of Christ. The Seals mark the end of the church. The Trumpets mark the end of Abraham's children through Isaac and Israel. The Thunders are the end of the Nations themselves. Those last 42 months are for the gleanings of who is left. Satan is in charge while those harvested are beheaded to avoid
the mark, avoid
worshipping and following Satan, and to remain
in the Lamb's book of life.