Hi Tom,
I agree with your assessment of Rom. 11:25. The church is made up of both Gentiles and Jews (which is all Israel). It isn't that the church is going to change, it is and always will be the body of Christ made up of all nations, all saved souls where race, sex, location or any other separation is looking at the church carnally. That said, what I believe is going to happen in the end is that the nation Israel will once again become the hub of Christianity, still the same church, only the focus of what God is doing, glorifying Himself, returning to where it all began, Jerusalem.
I also believe 2 Peter chapter 2 is speaking about the visible church (consisting of wheat and tares) as we see it in America today (who is saved and who isn't I can't say, only God sees the heart, but it is very, very difficult to differentiate the lost from the saved), It has mostly become a place where the gospel has been corrupted with the ideas and traditions of man. Why? mostly to fill the pews in order to get rich. The majority don't teach true doctrine, because they fear people might leave, believing there is a need to entertain to get the "world saved", bring the lost into the church. It has become a business. We read in 2 Peter chapter 2:
NASB
2 Peter 2:20 For if after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first.
I believe that is a warning to the church as we know it today. Because of the failures of those who are our pastors and leaders in the church (reminds me of how Israel ended), the mantle, so to speak is going to be given back to the nation of Israel. Not returning to Judaism, but the veil removed from the elect Jews where they recognize Christ as their saviour, a revival and a fulfillment of the prophecies given in the Word of God concerning the Israel still not fully realized. I am not saying there will not be any more "gentile" conversions, I'm saying the focus of God's power and strength will be returned to the nation one last time before the judgment.
I really do not see where this is hard to see or believe. We have seen revivals in different areas of the country throughout history where God glorified Himself in a mighty way, this is what I believe is going to happen in Israel, a reviving, an unveiling for the ethnic Jews. This will eventually lead to to the final prophecies spoken of in scripture to be fulfilled concerning the end times.
