Technically, Jesus was around during the Late Iron Age/Early Roman transitional period.
I'll shut up now
The mythology predates Jesus's arrival. Christianity is a based on common themes that originate way before the Jews knocked up the Torah (which is an evolution of these themes), the prophet, 'dying' for our 'sins' - coming back from the dead, ascending into heaven, the 3 wise men, the star in the sky and so on, these themes appear in numerous pre-Judeo-Christian religions going back to around the bronze age.
The mythology predates Jesus's arrival. Christianity is a based on common themes that originate way before the Jews knocked up the Torah (which is an evolution of these themes), the prophet, 'dying' for our 'sins' - coming back from the dead, ascending into heaven, the 3 wise men, the star in the sky and so on, these themes appear in numerous pre-Judeo-Christian religions going back to around the bronze age.