How did the writings of the NT come to be?

[pocaracas]

Speaking of [citation needed]:
wikipedia article on Crucifixion:

Crucifixion was used for slaves, pirates, and enemies of the state. It was considered a most shameful and disgraceful way to die. Condemned Roman citizens were usually exempt from crucifixion (like feudal nobles from hanging, dying more honorably by decapitation) except for major crimes against the state, such as high treason.[citation needed]

Notorious mass crucifixions followed the Third Servile War in 73–71 BC (the slave rebellion under Spartacus), other Roman civil wars in the 2nd and 1st centuries BC, and the Destruction of Jerusalem in 70 AD. To frighten other slaves from revolting, Crassus crucified 6,000 of Spartacus' men along the Appian Way from Capua to Rome.[citation needed] Josephus tells a story of the Romans crucifying people along the walls of Jerusalem. He also says that the Roman soldiers would amuse themselves by crucifying criminals in different positions. In Roman-style crucifixion, the condemned could take up to a few days to die. The dead body was left up for vultures and other birds to consume.[citation needed]

Under ancient Roman penal practice, crucifixion was also a means of exhibiting the criminal’s low social status. It was the most dishonourable death imaginable, originally reserved for slaves, hence still called "supplicium servile" by Seneca, later extended to provincial freedmen of obscure station ('humiles').[citation needed] The citizen class of Roman society were almost never subject to capital punishments; instead, they were fined or exiled. Josephus mentions Jews of high rank who were crucified, but this was to point out that their status had been taken away from them. The Romans often broke the prisoner's legs to hasten death and usually forbade burial.[citation needed]

A cruel prelude was occasionally scourging, which would cause the condemned to lose a large amount of blood, and approach a state of shock. The convict then usually had to carry the horizontal beam (patibulum in Latin) to the place of execution, but not necessarily the whole cross.[citation needed] Crucifixion was typically carried out by specialized teams, consisting of a commanding centurion and four soldiers.[citation needed] When it was done in an established place of execution, the vertical beam (stipes) could even be permanently embedded in the ground.[citation needed]

If all these claims are true, the video Brakeman posted is a bit skewed.... but the wiki info is not that trustworthy, apparently. although, the Encyclopædia britannica mentions the same things LINK:

There were various methods of performing the execution. Usually, the condemned man, after being whipped, or “scourged,” dragged the crossbeam of his cross to the place of punishment, where the upright shaft was already fixed in the ground. Stripped of his clothing either then or earlier at his scourging, he was bound fast with outstretched arms to the crossbeam or nailed firmly to it through the wrists. The crossbeam was then raised high against the upright shaft and made fast to it about 9 to 12 feet (approximately 3 metres) from the ground. Next, the feet were tightly bound or nailed to the upright shaft. A ledge inserted about halfway up the upright shaft gave some support to the body; evidence for a similar ledge for the feet is rare and late. Over the criminal’s head was placed a notice stating his name and his crime. Death, apparently caused by exhaustion or by heart failure, could be hastened by shattering the legs (crurifragium) with an iron club, so that shock and asphyxiation soon ended his life.

Crucifixion was most frequently used to punish political or religious agitators, pirates, slaves, or those who had no civil rights. In 519 bce Darius I, king of Persia, crucified 3,000 political opponents in Babylon; in 88 bce Alexander Jannaeus, the Judaean king and high priest, crucified 800 Pharisaic opponents; and about 32 ce Pontius Pilate had Jesus of Nazareth put to death by crucifixion.

Just how much of this was inspired by christianity is difficult to assess.