What do the gospel accounts we have today contain which might point to a motivation for their fakery?
It depends upon where you start your assumption chain. Galatians gives me some clues, but this assumes Galatians is not a fake. In Galatians, we can see a division in the church; 3 divisions, in fact: James, Peter of Antioch and Paul.
James: follow the whole Jewish law
Peter: follow the important parts of Jewish law
Paul: follow a single law, and worship Jesus as a God.
Now, it seems to me that for Jesus to have left such a divided legacy, he must not have had much authority. This could be the origin of the "prophet is not taken seriously in his home town" syndrome. Indian fakirs are not taken seriously in their home towns, either, because the locals have seen their bad sides. In Galatians, we get a picture of a group, trying to decide how they should proceed, using intellectual reasoning, rather than a group which blindly follows Jesus, because they witnessed God.
Unfortunately, there are a few options, as to why someone would invent a resurrection
- grief at losing a figurehead
- retaliation at the Jews for killing Jesus
- the body was stolen, or was lost (discount the whole Tomb saga as unlikely)
- competition for authority
You will notice that Paul trumps others by claiming to channel Jesus, and gets a new series of revelations from him; then even gets published, as if he is Jesus. Perhaps he is trumping those who claimed to have witnessed Jesus after crucifixion? And perhaps those people claimed to see various visions of Jesus, to trump Pharisiac Jews and those who were forming an original church. You can see an echo, back at Paul, from Matthew: "Take heed that no man deceive you. For many shall come in my name, saying, I am Christ; and shall deceive many."
Notice how Paul is the only one to have fulfilled this prophecy, because Acts says he did miracles. We have a Jesus in outback QLD, (Kingaroy)
, but I bet he hedges away from healing amputees, so he is not deceiving any but the very stupid.
Whoever can fake up the best story, with the most authority is going to make the most popular sect. It's evolution.
A resurrection is certainly world-changing. The world did change.
And the world changed when an Arab pedophile channeled Allah, and said he was reading from the crystal books in heaven. He proved that the Quran was from God, by challenging anyone to come up with a more perfect book. (And you thought the Bible was impressive.) Evolution and ignorance ensures that the most addictive crap always wins.
A fake resurrection is just as world changing. Mohammed was proud that he did no miracles - regarding them as crass.