Hey bud, you have to remember Revelation is full of symbolism. By Satan being bound to no longer deceive the nations does not mean he is powerless to do anything; after all, he is God's devil and just a pawn. But it is teaching salvation goes to every tribe tongue and nation. No longer just the Jews and there is nothing the devil can do about that. Hopefully, that makes a little more sense.
What I remember is that Revelation is a book of prophecy written in the apocalyptic style. I also remember, lessons learned on Messianic prophecy, that prophecy is always literally fulfilled. Do you remember why the Jews missed the first coming of Jesus? They allegorized all the Messianic prophecies so Jesus did not fit. What does amillennialism and post-millennialism do to eschatology/end times prophecies? It allegorizes it all. Where did we fail to learn the lessons learned after the first big failure of allegorizing prophecy? They missed the prophecy of Israel becoming a nation again that is found in Isaiah. In 1949, everyone was still saying it would never happen, and then it did. The prophecy was literally fulfilled. Israel is a beautiful paradise in large parts of the country. Prophecy says that would happen when the Jews returned. However, if you read Mark Twain when he visited Israel back in the 1940s I believe, he was clear when he said it was a vast empty wasteland. Prophecy literally fulfilled again. Then there is the miraculous victory when the Arab world tried to destroy Israel. I believe it was at this time that they had the miracle with the Menorrah that would not go out, even though they had no oil for it. Prophecy being fulfilled that many are missing because they allegorized it all away.
So lets look at the passage in Revelation about the binding of Satan.
"Then I saw an angel coming down from heaven, having the key to the bottomless pit and a great chain in his hand. 2 He laid hold of the dragon, that serpent of old, who is
the Devil and Satan, and bound him for a thousand years; 3 and he cast him into the bottomless pit, and shut him up, and set a seal on him, so that he should deceive the nations no more till the thousand years were finished. But after these things he must be released for a little while."
So, he is bound, cast into the bottomless pit, shut up, and sealed so that he should deceive the nations no more. Just what does it mean that he should deceive the nations no more. Well, as prophecy is very well explained, Revelation gives the answer later in the same chapter.
"7 Now when the thousand years have expired, Satan will be released from his prison 8 and will go out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together to battle, whose number
is as the sand of the sea. 9 They went up on the breadth of the earth and surrounded the camp of the saints and the beloved city. And fire came down from God out of heaven and devoured them."
So, if one reads this as straightforward as Messianic prophecy (I really don't think God has changed, but you are free to), we see that this is deceiving the nations into attacking God, or in this case, God's people. And it is literal attacking, like the Germans in WWII, and the Yom Kippur war where the Arabs tried to wipe out Israel. Do note how literally that covers the prophecy above. As such, allegorizing it is wrong. Especially if you add what Paul had to say.
"Now, brethren, concerning the coming of our Lord Jesus Christ and our gathering together to Him, we ask you, 2 not to be soon shaken in mind or troubled, either by spirit or by word or by letter, as if from us, as though the day of [
a]Christ had come. 3 Let no one deceive you by any means; for
that Day will not come unless the falling away comes first,
and the man of [b]sin is revealed, the son of perdition, 4
who opposes and exalts himself above all that is called God or that is worshiped, so that he sits [c]as God in the temple of God, showing himself that he is God.
5
Do you not remember that when I was still with you I told you these things? 6 And now you know what is restraining, that he may be revealed in his own time. 7 For the [d]mystery of lawlessness is already at work; only [e]He who now restrains will do so until He is taken out of the way. 8
And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. 9
The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, 10 and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. 11 And for this reason God will send them strong delusion, that they should believe the lie, 12 that they all may be condemned who did not believe the truth but had pleasure in unrighteousness."
This is prophecy. This is not the symbolism of Revelation, however lines can be drawn to Revelation, and it has been done. The allegorizing of prophecy is removing all meaning, just like when the Jewish religious leaders allegorized Messianic prophecy. They allegorized it to what they wanted it to mean. The Messiah would come to the aid of Israel, and would destroy the Romans. (I'm not sure if they updated their interpretations when their enemies changed, or not.) So you have post-millennialism, which believes that the church will overcome the world and then Jesus will return.
Yes, but he is unable to stop the spread of the gospel to all nations.
Of course he is. It isn't because he is bound. He's never been able to stop the spreading of the truth of God. Not in the Old Testament, and not in the New Testament. Even before he was supposedly bound at 70AD. He couldn't stop the Pentecost, he couldn't stop Peter with the Gentiles, he couldn't stop the disciples of John the Baptist joining the church, and he couldn't stop the Samaritans from joining the church. He couldn't cause Philip to trip and fall so that he missed meeting up with the eunuch from Ethiopia. As you can see, Satan could not stop it unbound, how would anything change with him bound? And that's forgetting that Revelation already defined what this deceiving of the nations was.
I don't understand that question and how it would interfere with Amillennialism.
If scripture is not fulfilled, then everything falls apart. Amillennialism states that not all men will die, because Elijah and Enoch have not died, and they won't die. Even Jesus died, since all men are appointed once to die. Even Jesus did not escape scripture. He was judged by the Father, and rose again, his sacrifice found satisfactory. Yet Elijah and Enoch never died. Amillennialism says they will never die. That is unfulfilled scripture, which means that scripture is faulty. As such, can we trust any scripture at all? Premillennialism has them come to earth to testify of God, and speak whatever God has for them to say in judgment, and then they die, three days later they get up and go back to heaven. Scripture fulfilled.