It is imagined that miraculously Jesus and the Bible arrived in the first century.
Jesus, the wonder working, virgin-born, saviour son of God with twelve disciples... under different guises had already existed as a literary trope for a thousand years or so.
The early Christians had no Bible. The texts which were collected to form the 'approved' versions of christian teaching was not made until the fourth century and continued to be modified for centuries after.
Sorry Splash but your emphasis on the number of manuscripts is very misleading.
The proliferation of Bible texts began about the ninth century. There are only a handful of manuscripts in existence from each of the second to the eighth centuries. The Ryland fragment, which I saw recently, is a sorry scrap of paper and gives little evidence of the supposed vigour of early Christianity.
The key to understanding Christianity is the recognition that there were many messianic cults vying for supremacy and patronage in the early years of the common calendar. There were many christian manuscripts circulating among the cults at their temples but never mentioning Jesus nor for that matter Jehovah.The label Jesus was a late inclusion to appeal to messianic minded Jewish punters who had a precedent for using this name. The Jews by custom as already discussed, were never to voice the 'sacred' name of God.
There was no original Bible. Manuscripts i.e. handwritten documents are notoriously susceptible to alteration by copying, forging and editing. It was only through the agency of the Roman Catholic Church that certain texts in circulation were authorised, forming what we now know as the Bible... and an orthodox interpretation was established at the demand of Constantine, hence the word Catholic meaning universal.
From these two factors of the fourth century; the book and the doctrine, all further Christian sects have arisen including the Adventist and subsequently the Russellites, Bible Students, and JWs.