Looking at sources, I found this:
The Quest for Mark’s Sources:
An Exploration of the Case for Mark’s Use of First Corinthians
Thomas P. Nelligan, Eugene, Oregon: Pickwick Publications, 2015 Review by Tom Dykstra
Oh dear.......... and all this picked up by Richard Carrier who used it to convince his readers that Jesus and the Jesus story was a myth.
The mythers....!
I'm not going to waste too much time on this, only to mention that I have been advocating the extraction and binning of any obvious inclusions from Christianity in to a deposition about the missions of people like the Baptist and Jesus, for a return of the laws, mostly those which supported the poor classes.
Oh well.......... In a moment, down below, let's snatch 1 Cor 1-2 and Mark 1:1-28 and have a look at that.
... the most prominent example being Mark’s borrowing from 1 Corinthians for his story of the last supper.
No doubt they had a last meal..... no doubt. But if the last supper is binned then the basic account lives on, strong.
It is the connections between Mark and 1 Cor in these surrounding texts that lead to this conclusion [that Mark depends on 1 Cor]. For example, preceding the Eucharist ........
Stop there.......... I've discarded the last supper as spin already.......moving onwards......
This is not to say Mark's sole source was Paul. From Papias (as recorded by Eusebius) we have:
"Mark, having become the interpreter of Peter, wrote down accurately all that he (Peter) mentioned, whether sayings or doings of Christ, not however in order. For he was neither a hearer nor a companion of the Lord; but afterwards, as I said, he accompanied Peter, who adapted his teachings as necessity required, not as though he were making a compilation of the Sayings of the Lord. So then Mark made no mistake, writing down in this way some things as he (Peter) mentioned them; for he paid attention to this one thing, not to omit anything that he had heard, nor to include any false statement among them."
The author of Mark had to be present at the arrest. The evidence is in the gospel account of the arrest.
What's wrong with these people?
It would seem evident that the Eucharist was celebrated in the Church before Paul's first writings, (c50AD) and the earliest Gospel (Mark, c60AD). While Mark can then be said to derive from Paul, we can surmise that Paul derives his wording from existing Liturgical practice.
So that's all the fuss, right there....... the Eucharist.
Richard Carrier has fetched himself quite a name and probably plenty of funds with his gambit..... because extreme atheists cling to this stuff.
Let's have a look at 1Cor 1-2
1 Corinthians
The First Epistle of Paul the Apostle to the Corinthians {1:1} Paul, called [to be] an apostle of Jesus Christ through the will of God, and Sosthenes [our] brother, {1:2} Unto the church of God which is at Corinth, to them that are sanctified in Christ Jesus, called [to be] saints, with all that in every place call upon the name of Jesus Christ our Lord, both theirs and ours: {1:3} Grace [be] unto you, and peace, from God our Father, and [from] the Lord
Jesus Christ. {1:4} I thank my God always on your behalf, for the grace of God which is given you by
Jesus Christ; {1:5} That in every thing ye are enriched by him, in all utterance, and [in] all knowledge; {1:6} Even as the testimony of Christ was confirmed in you: {1:7} So that ye come behind in no gift; waiting for the coming of our Lord
Jesus Christ: {1:8} Who shall also confirm you unto the end, [that ye may be] blameless in the day of our Lord
Jesus Christ. {1:9} God [is] faithful, by whom ye were called unto the fellowship of his Son
Jesus Christ our Lord. {1:10} Now I beseech you, brethren, by the name of our Lord
Jesus Christ, that ye all speak the same thing, and [that] there be
no divisions among you; but [that] ye be perfectly joined together in the same mind and in the same judgment. {1:11} For it hath been declared unto me of you, my brethren, by them [which are of the house] of Chloe, that there are contentions among you. {1:12} Now this I say, that every one of you saith, I am of Paul; and I of
Apollos; and I of
Cephas; and I of Christ. {1:13} Is Christ divided? was Paul crucified for you? or were ye baptized in the name of Paul? {1:14} I thank God that I baptized none of you, but Crispus and Gaius; {1:15} Lest any should say that I had baptized in mine own name. {1:16} And I baptized also the household of Stephanas: besides, I know not whether I baptized any other. {1:17} For Christ sent me not to baptize, but to
preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect. {1:18} For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God. {1:19} For it is written, I will destroy the wisdom of the wise, and will bring to nothing the
understanding of the prudent. {1:20} Where [is] the wise? where [is] the scribe? where [is] the disputer of this world? hath not God made foolish the wisdom of this world? {1:21} For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe. {1:22} For the
Jews require a sign, and the Greeks seek after wisdom: {1:23} But we preach Christ crucified, unto the Jews a
stumblingblock, and unto the Greeks foolishness; {1:24} But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God. {1:25} Because the foolishness of God is wiser than men; and the weakness of God is stronger than men. {1:26} For ye see
your calling, brethren, how that not many wise men after the flesh, not many mighty, not many noble, [are called: ]{1:27} But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty; {1:28} And base things of the world, and things which are despised, hath God chosen, [yea,] and things which are not, to bring to nought things that are: {1:29} That no flesh should glory in his presence. {1:30} But of him are ye in Christ Jesus, who of God is made unto us wisdom, and
righteousness, and sanctification, and redemption: {1:31} That, according as it is written, He that glorieth, let him glory in the Lord.
--------------- A quick read through the above with any words true to G-Mark are emboldened.
But quite a lot of G-Mark does have additions, imo, such as those underlined.
Mark {1:1} The beginning of the gospel of Jesus
Christ, the Son of God; {1:2} As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee. {1:3} The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths
straight. {1:4} John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins. {1:5} And there went out unto him all the land of Judaea, and they of Jerusalem, and were all baptized of him in the river of Jordan, confessing their sins. {1:6} And John was clothed with camel’s hair, and with a girdle of a skin about his loins; and he did eat locusts and wild honey;
{1:7} And preached, saying, There cometh one mightier than I after me, the latchet of whose shoes I am not worthy to stoop down and unloose. {1:8} I indeed have baptized you with water: but he shall baptize you with the Holy Ghost. {1:9} And it came to pass in those days, that Jesus came from Nazareth of Galilee, and was baptized of John in Jordan. {1:10} And straightway coming up out of the water, he saw the heavens opened, and the Spirit like a dove descending upon him: {
1:11} And there came a voice from heaven, [saying,] Thou art my beloved Son, in whom I am well pleased. {1:12} And immediately the Spirit driveth him into
the wilderness. {1:13} And he was there in the wilderness forty days, tempted of Satan; and was with the wild beasts; and the angels ministered unto him. {1:14} Now after that John was put in prison, Jesus came into Galilee, preaching the gospel of the kingdom of God, {1:15} And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel. {1:16} Now as he walked by the sea of Galilee, he saw Simon and Andrew his brother casting a net into the sea: for they were fishers. {1:17} And Jesus said unto them, Come ye after me, and I will make you to become fishers of men. {1:18} And straightway they forsook their nets, and followed him. {1:19} And when he had gone a little farther thence, he saw James the [son] of Zebedee, and John his brother, who also were in the ship mending their nets. {1:20} And straightway he called them:
and they left their father Zebedee in the ship with the hired servants, and went after him. {1:21} And they went into Capernaum; and straightway on the sabbath day he entered into
the synagogue, and taught. {1:22} And they were astonished at his doctrine: for he taught them as one that had authority, and not as the scribes. {1:23} And there was in their synagogue a man with an unclean spirit; and he cried out, {1:24} Saying, Let [us] alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us?
I know thee who thou art, the Holy One of God. {1:25}
And Jesus rebuked him, saying, Hold thy peace, and come out of him. {1:26} And when the unclean spirit had torn him, and cried with a loud voice, he came out of him. {1:27} And they were all amazed, insomuch that they questioned among themselves, saying, What thing is this? what new doctrine [is] this? for with authority commandeth he even the unclean spirits, and they do obey him. {1:28} And immediately his fame spread abroad throughout all the region round about Galilee.