There is no evidence of a SUPREME pastor (James, Peter or anyone) in the New Testament.
Your statement is simply false; there is both New Testament and post-New Testament evidence that James was recognized as the head of the New Testament Church until at least 62 A.D:
Acts 12:17. But motioning to them with his hand to be silent, he described to them how the Lord had led him out of the prison. And he said, "Report these things to James and the brethren." Then he left and went to another place.
Acts 15:13. After they had stopped speaking, James answered, saying, "Brethren, listen to me.
14. "Simeon has related how God first concerned Himself about taking from among the Gentiles a people for His name.
15. "With this the words of the Prophets agree, just as it is written,
16. 'AFTER THESE THINGS I will return, AND I WILL REBUILD THE TABERNACLE OF DAVID WHICH HAS FALLEN, AND I WILL REBUILD ITS RUINS, AND I WILL RESTORE IT,
17. SO THAT THE REST OF MANKIND MAY SEEK THE LORD, AND ALL THE GENTILES WHO ARE CALLED BY MY NAME,'
18. SAYS THE LORD, WHO MAKES THESE THINGS KNOWN FROM LONG AGO.
19. "Therefore it is my judgment that we do not trouble those who are turning to God from among the Gentiles,
20. but that we write to them that they abstain from things contaminated by idols and from fornication and from what is strangled and from blood.
Acts 21:18. And the following day Paul went in with us to James, and all the elders were present.
19. After he had greeted them, he
began to relate one by one the things which God had done among the Gentiles through his ministry.
20. And when they heard it they
began glorifying God; and they said to him, "You see, brother, how many thousands there are among the Jews of those who have believed, and they are all zealous for the Law;
21. and they have been told about you, that you are teaching all the Jews who are among the Gentiles to forsake Moses, telling them not to circumcise their children nor to walk according to the customs.
22. "What, then, is
to be done? They will certainly hear that you have come.
23. "Therefore do this that we tell you. We have four men who are under a vow;
24. take them and purify yourself along with them, and pay their expenses so that they may shave their heads; and all will know that there is nothing to the things which they have been told about you, but that you yourself also walk orderly, keeping the Law.
25. "But concerning the Gentiles who have believed, we wrote, having decided that they should abstain from meat sacrificed to idols and from blood and from what is strangled and from fornication."
26. Then Paul took the men, and the next day, purifying himself along with them, went into the temple giving notice of the completion of the days of purification, until the sacrifice was offered for each one of them.
Gal. 1:19. But I did not see any other of the apostles except James, the Lord's brother.
Gal. 2:9. and recognizing the grace that had been given to me, James and Cephas and John, who were reputed to be pillars, gave to me and Barnabas the right hand of fellowship, so that we
might go to the Gentiles and they to the circumcised.
10.
They only
asked us to remember the poor--the very thing I also was eager to do.
Peter (Cephas) Opposed by Paul
11. But when Cephas came to Antioch, I opposed him to his face, because he stood condemned.
12. For prior to the coming of certain men from James, he used to eat with the Gentiles; but when they came, he
began to withdraw and hold himself aloof, fearing the party of the circumcision.
Notice the order given in Gal. 2:9: James and Cephas and John.
Post New Testament evidence is found in the following writings:
• Gospel according to Thomas
• Apocryphon of James
• Protevangelium of James
• First and Second Apocalypse of James
• Gospel of Peter
• Apocalypse of Peter
• Kerygma Petrou
• Acts of Peter
• Letter of Peter to Philip
• Act of Peter
• Memoirs of Hegesippus
Hegesippus, who lived immediately after the apostles, wrote in the fifth book of his Memoirs,
“James, the brother of the Lord, succeeded to the government of the Church in conjunction with the apostles.”
Note: All scriptures are from the NASB, 1995.