I believe that ALL the epistles from Hebrews-Revelations are written to Jewish people and NOT the Church, the Body of Christ. It is evident, that while all the bible is for us, not all of it was written directly to us, or about us today!

The books of God's Word that pertain and speak directly to us, and about us today as gentiles are Paul's 13 books Romans-Philemon (Rom 11:13).

All the other 53 books of the bible pertain to Israel, the Law and God's prophetic program to them. Paul's 13 letters teach us about the Grace message...the Mystery of Christ, which was kept secret til revealed to Paul (Acts 9:15...Rom 11:13...11:25...16:25...1 Cor 2:6-8...Eph 3:1-10, Col 1:25, etc.).

So yes, the Jews addressed in Hebrews-Revelation are beleivers (although an unbelieving Jew could read them in that day and be saved...as an unbelieving Jew or gentile can read Paul today can be saved)...but those Jews who had, and will in the future read Hebrews-Revelation are believing members of the Jewish/Messianic/Earthly Kingdom/Pentecostal/Water Baptist church, and NOT the current church, the Body of Christ!

2)You mentioned being "born again" and placed in the Body of Christ.

In my study of the scriptures our Apostle Paul NEVER used that term. In fact, that is a distinctly Jewish term in the bible. In John 3, the Lord tells Nicodemus that "ye" (plural for that Nation) must be born again. The Nation of Israel was God's firstborn (Exodus), and will be a Nation "born in a day" (Isa), when the Lord returns to them. So when Peter tells them that they are born again...it refers only to Israel. Gentiles where NEVER born of God like Israel, so we were just lost, cast off sinners in need of salvation (Rom 1).

3) Yes, today, in the dispensation of the Grace of God, the dispensation that started with the salvation of Saul of Tarsus/our Apostle Paul (Acts 9, 1 Tim 1:15-16), every individual lost Jew and Gentile who trust Christ's shed blood for their sins and that alone gets saved and becomes a member of His Body.

Therefore those Jews that Peter/James/John/Jude address in Hebrews-Revelation are NOT part of the current body of Christ made up of both Jew and gentile since Paul. That is why those books fit the FUTURE time period, AFTER the rapture of the church, the Body of Christ. After we are gone, God will commend those books (thru His 2 tribulation witnesses) to the Jewish world in order that they might trust Christ as Messiah and His Apostles to keep them strong thru the tribulation period and the opposition of the Anti-Christ.

4) Why do gentile believers have a different set of instructions from the Jews? Because God is dealing with the gentiles today (even lost Jews today are considered gentiles in the eyes of God...Rom 11:31-32). But after God is finished with us today at the rapture...He will again start dealing with Israel as a nation, making a distinction between mankind based on whether they are Jews or not.

5) Gentile believers who get saved in the end time? Again, just like time past, when God wanted to deal with the gentiles, He did it THRU the Nation of Israel. He spoke His Word to Israel, and then they took it out to the gentiles. Like Moses with Pharoah. God spoke to Moses and Moses spoke to Pharoah.

Psalm 147:19...He sheweth his word unto Jacob, his statutes and his judgments unto Israel. 20 He hath not dealt so with any nation: and as for his judgments, they have not known them. Praise ye the LORD.

Isa 2:3...And many people shall go and say, Come ye, and let us go up to the mountain of the LORD, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for out of Zion shall go forth the law, and the word of the LORD from Jerusalem.

So too will be the future. God wrote those books to the Jews, and THEY will them teach the gentiles who are saved into the kingdom the Word of God.

Mat 28:19...Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.

6) Is there any "secondary" application in those books? Yes, like ALL of God's Word, there are spiritual applications/inter-dispensational principles such as faith in God thru Christ, etc. But we must be VERY careful to always "rightly divide" the Word of Truth, because there is MUCH that does not translate from one dispensation to another (Water baptism, sabbath observance, keeping the law, etc). So yes, in some things, spiritual application can be made, even from books not addressed to us directly, BUT never INTERPRET the passage to be to you or about you unless it is from Paul's 13 epistles rightly divided!

And yes, the circumstances that those Jews will be living under will be VERY different. Supernatural manifestations (even Satanic ones...2 Thes 2) will be prominent again. Destruction/persecution/tribulation will be upon the earth like we have NEVER seen in our lifetimes.

7) Yes, the kingdom of heaven on earth was still being offered to Israel during early Acts (til Stephen's stoning in Acts 7). And yes, Peter talked about "grace" to Israel. But remember, God is gracious, and has always been gracious with men, even under the Law (the reason He allowed the sacrifices). Even Noah "found grace in the eyes of the Lord"...Gen 6. So although there has been grace in every dispensation, there has NEVER been an entire UNPROPHESIED/SECRET dispensation of pure GENTILE grace like it is today. God's unmerited favour is extended to all men today without distinction! Today, God is not imputing trespasses to the world in judgment...2 Cor 5 (he will after they die without trusting Christ..Rom 1:32..Heb 9:27).

The grace that Peter speaks about is the "sprit of Grace" that God will pour out on that Nation thru the New Covenant paid for by the blood of their Messiah.

Zech 12:10...And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.

Jer 31:31...Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah: 32 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD: 33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people. 34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.

So the grace that Peter speaks of to Israel is the PROPHESIED grace of the New Testament to them fulfilled in Christ's kingdom!

Yes, James and John had a "harder" time with "our" grace because Israel's grace was combined with works...James 2:10-17..and our's is not.

Rom 4:4-5...Now to him that worketh is the reward not reckoned of grace, but of debt. 5 But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.

You are absolutely right that the "false teachers" of their day are different from our's!

Yes, our Apostle Paul warns us about those teachers who deny his DISTINCT Apostleship/ministry/message...who do not "rightly divide" the scriptures...but who mix law and grace together.

They won't neccesarily deny who Jesus Christ is (most will actually be saved brethren), but they will deny the "preaching of Jesus Christ according to the revelation of the mystery"...Rom 16:25. They will be "enemies of the Cross" which means that we no longer need to perform to please God during our Christian life to "STAY" saved (works).

No, James/John/Peter tells the Jews that their false teachers will deny that Christ came in the flesh or that Jesus of Nazareth is the Christ/Messiah. So yes, Satan's false teacher tactics changes depending on the dispensation.

Yes, that is not something to warn grace believers today about.

Yes, Jesus told His followers during His earthly ministry to Israel to love one another fervently because as they approach the "end" of time of this present world and His return, the love of many will wax cold. So John exhorts the Jews of his day, and future from us, to continue in Christ's love and love one another!

Yes, your use of the word "conditional" or even "evidential" (they had to show it and make it evident with their deeds) definetely describes John's language.

Yes, NO ONE today loves the brethren in the Body perfectly, although Paul exhorts us to grow/abound in our love towrds one another. But even if we don't...it won't keep us from heaven. But the Jew of prophecy MUST continue on to get into the kingdom.