Jesus's credentials were pretty good you know ;)..
For a start his arrival was foretold centuries before just as he said, - "All things about me in the law of Moses,the Prophets and the Psalms,must be fulfilled" (Luke 24:44)

And when he arrived he didn't skulk in some underground hideout, he travelled all over Israel for 3 long years in front of the people and the occupying Roman Army, that's a lot of eyewitnesses -