If Jesus existed then maybe he didn't die as evidenced by post-cruxifiction activities so:
- Imposter (why did no one recognise him).
- Someone took fall for him.
- He didn't die on cross (on there a few hours , soldier bribed to claim speared) and needed some time to recover.
- Elaborate ruse worked up by someone in authority (a high level convert).
If Jesus did die:
- Imposter
- Made up stories
What did not happen:
- Came back to life from a dead state due to supernatural reasons after paying supernatural debt to supernatural self to fulfil supernatural laws broken by supernatural first man and woman.