And that description is found after the 7th trumpet, which is the last trumpet in the Bible, and after "the time of the judgment of the dead".
Revelation 12 also includes the birth and death of Christ.
That should be a hint that the first part of the chapter is a history lesson.
Do you think Satan is now in heaven in the presence of God, and Christ?
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At the cross Jesus when he was offered the gall, said 'it is finished'. The same term is used in connection with the judgments of Revelations:
Rev 10:7 the seventh angel, when he shall begin to sound, the mystery of God should be finished, G5055
11:7 Now when they (the two prophets) have finished their testimony,
15:1 Seven angels having the seven last plagues; for in them is filled up G5055 the wrath of God.,
The operative term here is fulfilled, with it the crucifixion, the mystery of God, the prophets testimony marking the middle of the Tribulation period, and the seventh angle who had the vials of wrath, poured out at the end of the Great Tribulation. It's used to speak of fulfilling the Law (Rom. 2:27), fulfilling the lusts of the flesh (Gal. 5:15), and finishing a race (2 Timothy 4:7).
In answer to your question, yes, Satan still makes his way into the courts of heaven even though he was cast down when the Apostle's started their ministry, he went back.
And the great dragon was hurled down—that ancient serpent called the devil and Satan, the deceiver of the whole world. He was hurled to the earth, and his angels with him. And I heard a loud voice in heaven, saying: “Now have come the salvation and the power and the kingdom of our God, and the authority of His Christ. For the accuser of our brothers has been thrown down, he who accuses them day and night before our God. They have conquered him by the blood of the Lamb and by the word of their testimony. And they did not love their lives so as to shy away from death. (Rev. 12:9-11)
Half way through the Tribulation the Devil is cast down, probably forced to posses the Antichrist. I think he has been kicked out plenty of times but this time he isn't coming back. He does get out of the Abyss for a short time and because of that the nations surround the New Jerusalem, that's his last hooray. In the account of Job he was the accuser, in the temptation of Christ he was the tempter, and when Jesus warned Peter that he would be tested he said it was because the Devil had demanded it:
"Simon, Simon, behold, Satan demanded to have you, that he might sift you like wheat, but I have prayed for you that your faith may not fail; and when you have turned again, strengthen your brethren." And he said, "Lord, I am ready to go with you to prison and to death." He said, "I tell you, Peter, the [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] will not crow this day, until you three times deny that you know me." (Luke 22:15)
Yea I think the Devil makes his way to the courts of heaven, I think he makes trouble for people of faith every chance he gets. I think he is in the outer courts, certainly not approaching the throne but can still communicate with God on some level. I think that ends half way through the tribulation and I have ample support from Scripture to support that.
Grace and peace,
Mark