In one of my previous posts We are saved for...the question was "why are we saved"? One comment that came back was;
God saved us so that we will eventually replace the 1/3 of the angels that fell.
I have thought much over this and as much as I disagree with this point understand that there is possibly another side to it.
First of all lets put some things into perspective of fallen angels [I'm yet to see the very mention of 1/3 that has fallen]
The Bible does not specifically address the issue of God's giving the fallen angels an opportunity to repent, but we do know principles and can extrapolate from them an educated guess. First, Satan (Lucifer) was one of the highest angels, perhaps the highest (Ezekiel 28:14). Lucifer—and all the angels—were continually in God’s presence and had a complete knowledge of the glory of God, unobstructed by the things that keep mankind from knowing Him fully. Therefore, they had no excuse for rebelling against God and turning away from Him. For Lucifer and the other angels to rebel despite what they knew about God is the utmost of evil, and this most likely results in God's not giving Satan and the other fallen angels the opportunity to repent.
Second, God did not provide a plan of redemption for the angels as He did for mankind. The fall of the human race necessitated an atoning sacrifice for sin, and God provided that sacrifice in Jesus Christ. In that plan of redemption, God redeemed the human race and brought glory to Himself for His grace, love and mercy. No such sacrifice was planned for the angels. In addition, God referred to those angels who remain faithful to Him as His “elect angels” (1 Timothy 5:21), and we know from the biblical doctrine of election that those whom God elects to salvation will be saved, and nothing can separate them from God’s love (Romans 8:38-39). Clearly, those angels who rebelled were not “elect angels” of God.
Finally, the Bible gives us no reason to believe they would repent even if God did give them the chance (1 Peter 5:8). The fallen angels seem completely devoted to opposing God and attacking God's people. The Bible tells us that one of the things God judges on is how much knowledge of Him a person possesses (Luke 12:48). The fallen angels, then, are even much more deserving of God’s wrath because of the exceedingly great knowledge they had about God.
One passage that is used in the defence to the replacement is from Matthew Matthew22:30;
At the resurrection people will neither marry nor be given in marriage; they will be like the angels in heaven.
The above is the doctrines that Christ displeased the infidel Sadducee's with, as well as the Pharisees and Herodians. He carried the great truths of the resurrection and a future state, further than they had yet been reveled. There is no arguing from the state of things in this world, as to what will take place hereafter. Let truth be set in a clear light, and it appears in full strength. Having thus silenced them, our Lord proceeded to show the truth of the doctrine of the resurrection from the books of Moses. God declared to Moses that he was the God of the patriarchs, who had died long before; this shows that they were then in a state of being, capable of enjoying his favour, and proves that the doctrine of the resurrection is clearly taught in the Old Testament as well as in the New. But this doctrine was kept for a more full revelation, after the resurrection of Christ, who was the first-fruits of them that slept. All errors arise from not knowing the Scriptures and the power of God. In this world death takes away one after another, and so ends all earthly hopes, joys, sorrows, and connexions. How wretched are those who look for nothing better beyond the grave and that we will not replace them but will be like them !
One last point being, on the 1/3 replacement argument is that if there were 99 angels in heaven for example and 1/3 fell that means that 33 people can be saved thus replacing the fallen ones. This has two errors, first of all the created number needs to be a direct division of 3 and the other is once the 1/3 has been counted, what happens to the rest of those who are saved. The bible is very clear that all who call on the name of the Lord shall be saved.
Hope the above helps
Richard