1) John was an apostle to Israel, not the body of Christ.
2) His ministry and therefore his epistles where written to believing Jews who were saved during the previous dispensation, about the Kingdom gospel that was preached by Jesus, Peter, James, et al. per their agreement with Paul as recording in Galatians 2...
3)
Galatians 2:7 But on the contrary, when they saw that the gospel for the uncircumcised had been committed to me, as the gospel for the circumcised was to Peter 8 (for He who worked effectively in Peter for the apostleship to the circumcised also worked effectively in me toward the Gentiles), 9 and when James, Cephas, and John, who seemed to be pillars, perceived the grace that had been given to me, they gave me and Barnabas the right hand of fellowship, that we should go to the Gentiles and they to the circumcised.
Just so ones can understand I am still on the subject of the necessity of the preaching of the resurrection for salvation, I am defending my previous comments per 2 John 1.
I think, CJP69, that we have more with which we agree than not, so I will just make a couple observations.
Concerning point 1 above;
John was unique among the apostles in this way. He wrote 5 of the New Testament letters.
John - 1) Information under the dispensation of Law -past tense - Things that were - The ministry of Jesus
1st, 2nd, 3rd John - 2) Information under the dispensation of grace - present tense -Things that are - The churches
Revelation of Jesus Christ - 3) Information under the dispensation of the "fullness of times") - future tense - Things that shall be hereafter.- The day of the LORD
John was the only apostle with this distinction. All his works were written after Israel lost her national identity and her people were dispersed into the nations in 70 AD when the temple, the seat of God's government, was destroyed, and they were separated (dead) from God and came under the control of gentiles laws.
John was an eye witness of the events of three distinct dispensations and the eternal state..
Concerning point #2 above;
While I will agree that the 3 letters John wrote about this dispensation was instruction for his own people, it was not as an apostle, but as a father. He did not use the word Israel in any of those letters. In fact, John only used the word Israel 7 times total. Four times he used the word in his gospel account and 3 times in the Revelation. It is fitting that he did not use the word in his three epistles because the apostolic era ended with the dispersion of the nation Israel and John seems to be the only one of the 12 left alive from that point in history. The apostles, the band of 12, were ministers to Israel, or as God put it in a few places in scripture, to the "creature." Israel is now dead and buried and awaiting resurrection, in John's day. Time is not progressing for dead entities in the grave. God almost always divides his number for complete things into 3+4 = 7, or 4+3=7. this is easily evident in scripture if you are looking for it.
Concerning Point #3
Ga 2:7 But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter;
8 (For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the Gentiles)
9 And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we should go unto the heathen, and they unto the circumcision.
These are wonderful and necessary scriptures for our understanding but they do not teach two different gospels or that there existed one gospel for the Jews and another for the gentiles. Verse 9 defines what is meant and it is Paul and Barnabas who will be taking the gospel to gentiles while the focus of the ministry of the twelve would be to the circumcision, which of course, was a broader application than just Jews.
It was Peter who "opened the door of faith" to the gentiles in 40 AD and the first gentile was saved by hearing the gospel of Christ that he preached to them. We are given the essence of the sermon in Acts 10 and the resurrection is in it. Read Acts 14:27 and context here.
Ac 10:34 Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:
35 But in every nation he that feareth him, and worketh righteousness, is accepted with him.
36 The word which God sent unto the children of Israel, preaching peace by Jesus Christ: he is Lord of all:
37 That word, I say, ye know, which was published throughout all Judaea, and began from Galilee, after the baptism which John preached;
38 How God anointed Jesus of Nazareth with the Holy Ghost and with power: who went about doing good, and healing all that were oppressed of the devil; for God was with him.
39 And we are witnesses of all things which he did both in the land of the Jews, and in Jerusalem; whom they slew and hanged on a tree:
40 Him God raised up the third day, and shewed him openly;
41 Not to all the people, but unto witnesses chosen before of God, even to us, who did eat and drink with him after he rose from the dead.
42 And he commanded us to preach unto the people (of Israel), and to testify that it is he which was ordained of God to be the Judge of quick and dead.
43 To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins.
Peter had to overcome some Jewish ceremonial traditions (dispensational rules) before he could preach to gentiles and he had to be taught by Christ himself that salvation is provided to all on the conditions of faith in certain things pertaining to himself and contained concisely in the package called "the gospel," not the least of which is his resurrection from the dead.