I would presume that none of the actual disciples of Christ believed He literally rose from the death given its improbability. What we have as a record are gospels written by second or third generation Christians based on oral traditions some 35 - 65 years after Jesus was crucified. So no first hand witneses, and a narrative that has embellishments, as the apostles taught to a predominantly Greco-Roman audience.
John, a first generation Christian, was an eyewitness of the resurrection.
1John 1:1 “That which was from the beginning, that which we have heard, that which we have seen with our eyes, that which we beheld, and our hands handled, concerning the Word of life”
Luke, a first generation Christian, was not an actual eyewitness of the resurrection but his account of the resurrection came from those who witnessed the resurrection.
The very reason why the NT must be written during the first generation of Christianity is, the “eyewitnesses and ministers of the word” –Luke 1:2 are still alive and could pass on “the exact truth about the things you have been taught” –Luke 1:4 on to the next generation.
Mathew, a first generation Christian, wrote the book of Mathew.
Mark, a first generation Christian, wrote the book of Mark.
What happens if nothing was written during the first generation and all of them died?
Everything from the next generation’s accounts would be nothing but hearsay, but God did not plan it that way, did He?
So, any accounts different or does not harmonize with the NT did not come from the first generation’s accounts on Christianity, i.e., [Christ earthly ministry, His death, burial, and resurrection] and therefore, all of them are nothing but hearsay, right? IOW, anything you were or are saying if it does not agree with the NT, are nothing but hearsay, right?
"as the apostles taught to a predominantly Greco-Roman audience."
The Gentiles, i.e., the “Greco-Romans audience” were not evangelized by the apostles until chapter 10 of Acts by Peter. IOW, Gentiles did not come into the picture before Acts chapter 10.