If Jesus was real and there was a second coming... well he'd probably start off as any kid would, to a mild family; then, being the reincarnation of Jesus, talks to God. He becomes a member of the church and starts preaching. He then starts preaching against things in the modern interpretation (and all preceding interpretations) of the Bible pissing off half of his church. He gains some followers, but the catholic church doesn't care for him.
He then proclaims he's the second coming; half his followers leave due to suspicions of wacko-ness and he now only has a few followers left. He starts preaching and performing "miracles" and slowly inspires and annoys people all over the world. Currently established religions ignore or despise him, especially the catholic church who looses members to him and still detests his preachings that contradict the Bible.
Him and his followers are ostracized for years to come until eventually Jesus dies again and comes back to life ether filled with preservatives for regular burials, crispy from a funeral pyre, or with half his organs or limbs removed from ether being a organ donor or blown up by some religious terrorist.
A lot of Catholics would apologize, some would be in disbelief, and us Atheists would be all giddy with curiosity for him to explain how exactly he did that.
Because if he really was able to come back to life, even as a Zombie, then how he did that would be pretty awesome to experiment with.