It is confirmed that the author of gMark did not know of Jewish customs for the preparation of a dead body before burial which means the writer was not a Jew and was not living among Jews.
Now, where did the author of gMark get his information for his story about John the Baptist?
The answer is found quite easily after reading at least the very first chapter of the so-called Gospel.
Examine gMark .
Mark 1.4-14
John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins.
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……
Now after that John was put in prison, Jesus came into Galilee, preaching the gospel of the kingdom of God,
Anyone familiar with the works of Josephus would immediately realize that the author of gMark used “Antiquities of the Jews” to get details about John the Baptist.
Examine Josephus’ Antiquities of the Jews written c 93 CE or the 13th year of Domitian.
Antiquities of the Jews 18.5..2.
Now some of the Jews thought that the destruction of Herod’s army came from God: and that very justly, as a punishment of what he did against John, that was called the baptist. For Herod slew him [About Feb. A.D. 32.]; who was a good man, and commanded the Jews to exercise virtue; both as to righteousness towards one another, and piety towards God; and so to come to baptism.
For that the washing [with water] would be acceptable to him, if they made use of it, not in order to the putting away, [or the remission] of some sins [only,] but for the purification of the body: supposing still that the soul was thoroughly purified beforehand by righteousness. Now when [many] others came in crouds about him; for they were very greatly moved [or pleased] by hearing his words..
It is further seen that the John the Baptist story was derived from Antiquities of the Jews when one examines gMark 6 where it is claimed Herod [Antipas] married the wife of his brother..
Mark 6
17 For Herod himself had sent forth and laid hold upon John, and bound him in prison for Herodias' sake, his brother Philip's wife: for he had married her.
Antiquities of the Jews 18 5.4
After whose birth Herodias took upon her to confound the laws of our countrey, and divorced her self from her husband, while he was alive, and was married to Herod [Antipas], her husband’s brother by the father’s side..
Not only did the author of gMark use Josephus’ Antiquities of the Jews” but the writer also used his autobiography “The Life of Flavius Josephus”.
Only the Life of Flavius Josephus contains a story where Josephus himself begged Titus for three crucified victims to be taken down from their crosses and one survived.
The Life of Flavius Josephus
….as I came back I saw many captives crucified: and remembred three of them, as my former acquaintance. I was very sorry at this in my mind; and went with tears in my eyes to Titus, and told him of them. So he immediately commanded them to be taken down, and to have the greatest care taken of them in order to their recovery. Yet two of them died under the physicians handsL while the third recovered…
In gMark, it is claimed Jesus of Nazareth was crucified along with two others but only he recovered or was raised from the dead..
Mark 15..27
And with him they crucify two thieves; the one on his right hand, and the other on his left.
Even, the trial of the supposed Jesus of Nazareth was taken from Josephus’ Wars of the Jews” where Jesus the son of Ananus was put before Albinus.
Wars of the Jews 6.5.3
And when Albinus, (for he was then our procurator;) asked him, “Who he was? and whence he came? and why he uttered such words?” he made no manner of reply to what he said…..
Mark 15.4-5
And Pilate asked him again, saying, Answerest thou nothing? behold how many things they witness against thee. But Jesus yet answered nothing; so that Pilate marvelled.
The evidence is clear gMark, the earliest NT Jesus story, was composed after the writings of Josephus or no earlier than at least c 93 CE or after the autobiography of Josephus.