Hi all, another long post.
Sorry, but I enjoy giving the righteous headaches. Many theists try to draw a straight line of gospel and so their particular sect of christianity back to the alleged events and traditions of the mid 1st century. They are very wrong in their assumptions. Note I am using the name “paul” as an identification place holder for the author of the epistles that appear in modern bibles.

At about 70CE there were many sects of Christianity one of the more numerous were the Ebionites. Like all Messainaic cults/sects of the time they were exclusively Jewish, and considered Paul's drive to convert the gentiles (without conversion to Jewry) blasphemous. The vegetarian Ebionites (meaning “the poor men”) used a very early text of Matthew without the later additions of the virgin birth (Chapters one and two). They considered Jesus (much like the later Arians) to be a man not divine, but a man who attained his messiah status by his adherence to the law (Torah) and his self sacrifice for the Law of YHWH and God of Moses.

They also believed that Jesus was adopted by god :In the oldest manuscripts of the Bible, Jesus kept God's laws so well that on his baptism, God adopted him as his son (Matt. 3:16, Mark 1:9-10 and Luke 3:22. In older manuscripts Luke 3:22 quotes Psalm 2:7: "You are my Son, today I have begotten you"), and sent him to the cross as a truly innocent, perfect sacrifice, to atone for the sins of all mankind. Thus fulfilling the promises in the Jewish scriptures.

These passages were extensively edited by the Pauline church in later years to prevent the spread of “adoptionism' and very successfully too...but modern day discoveries of older texts prove the lie of the Roman editors. Another passage attributed to Jesus is in Both Mark and Luke which justifies the Ebionites position. “ (Mark 6:7-13 Luke 9:1-6)
"5These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not:6But go rather to the lost sheep of the house of Israel.7And as ye go, preach, saying, The kingdom of heaven is at hand"
In one line: “Only save the jews lads, ignore everyone else”. A directive that Paul ignored.

Paul hated them (because they vociferously opposed his conduct, they even named him apostate, and denied his message to the Gentiles was divinely ordained) and when in the Second Council of Jerusalem Paul's actions and his supposed “revelations” regarding circumcision and meeting Jesus were denied he had this to say:
“Gal 2:4-9 4 And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage: 5 To whom we gave place by subjection, no, not for an hour; that the truth of the gospel might continue with you. 6 But of these who seemed to be somewhat, (whatsoever they were, it maketh no matter to me: God accepteth no man's person:) for they who seemed to be somewhat in conference added nothing to me: 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. (KJV)
Note: Paul is having a whinge but saying nothing of the four principles that the Second Council (Headed by James) had imposed on him, and which he continued to ignore.

On hilarious (imagine the discomfort) anecdote is from when the Early Roman Church Fathers visited Judea (in the search of some justification for the Pauline gospels) “Indeed, when in 160 Bishop Melito of Sardis went to Judea to discover what had become of the legendary Jerusalem Church, to his dismay he found not the descendants of the apostles, but instead a small group of [...] Christians, who called themselves the Ebionites or 'Poor Men', [who] had their own Gospel of the Ebionites and also a Gospel of the Hebrews, a Gospel of the Twelve Apostles and a Gospel of the Nazarenes. All of these gospels differed significantly from the gospels of the New Testament.”
"The Jesus Mysteries" by Timothy Freke & Peter Gandy (1999)

Sadly none of the Ebionites' gospels and other books survived the Pauline (roman) church's pogrom. Ebionites were systematically hounded, their books and places of worship destroyed by the Pauline church until none survived. Authors such as Tertullian, Origen of Alexandria and sundry other church toadies wrote at great length about the Ebionites and making wild and unsubstantiated claims about their personal habits and rites. The Roman church also edited the passages of the bible that plainly stated that God adopted Jesus and added two whole chapters to Matthew about the virgin birth and so on. Most of what we know about them comes from the vitriol of their enemies. However they lived, their brand of Jewish christianity prospered and gained non jewish converts despite circumcision. They had their faith until it was finally eradicated in the 4th Century CE and in many ways they were closer to the Jesus of history (if one existed) than any later Pauline incarnation.