It’s possible that he was a time traveller, although if he saw the shambles that religion has caused in the 21st Century, he might have had second thoughts.

Hi, don’t know, but Dr. Who might be able to help you!

You wouldn’t be considered the Messiah by the Jews unless you actually fulfilled the Jewish prophecies, regardless of what kind of “magic” you did or what medicines you had. You know, you’d have to built the temple, ingather all the Jews, put a complete, total end to war, poverty, illness, etc.

This is why the Jews don’t rely on “miracles” as proof of the Messiah like the Christians do, but only on whether the person fulfills the actual prophecies for the Messiah. And of course, Jesus was all about the miracles and magic, but not so much about fulfilling those prophecies.