Where, specifically, do you see Revelation 12 contradicting that satan is currently bound by Christ's death and resurrection? What verse are we dealing with? Because, as BABerean just pointed out - the way I see it, Rev 12 coincides very well with the belief that satan is bound - disarmed by the victory of Christ's work on the cross - now.
A cpl of things we have to keep in mind are the following. satan is bound so that he can no longer deceive the nations while he is bound. His binding idoesn't stay in affect up until his demise in the lake of fire. satan is loosed after he has been bound, then following that, he is cast into the LOF. What does it mean when he is loosed then, assuming the victory of Christ's work on the cross had to do with him being bound? Do we just undo all of the work Christ did on the cross? Because once he is loosed, he obviously is no longer bound.
Another thing, once satan gets cast to the earth, he is not being depicted as being bound and shut up in a pit. He is being depicted as just the opposite, one who is not bound and shut up in a pit, but one who is roaming freely about throughout the earth. so where then does he initially get bound in Revelation 12? It has to be a time that he is already residing on the earth, the fact Revelation 20:1 tells us that an angel has to come down from heaven first in order to even cast him into the pit. After the war in heaven, Revelation 12 shows satan residing on the earth.
What would make this simple would be the following, assuming some of you are correct.
Revelation 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
10 And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
11 And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
13 And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child.
14 And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent.
15 And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away of the flood.
16 And the earth helped the woman, and the earth opened her mouth, and swallowed up the flood which the dragon cast out of his mouth.
17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Revelation 20:1
And I saw an angel come down from heaven , having the key of the bottomless pit and a great chain in his hand.
2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years,
Show in the verses I supplied from Revelation 12, where Revelation 20:1-2 initially fits. Does it fit verse 7? Verse 8? So on and so on.