I think he'd be shocked to learn that a religion evolved from his life and wonder why so many profess to love him but don't follow his teachings.
He be kinda bemused at first but don't forget this was a man of the people. He hung out with all sorts of unsavoury types like tax collectors, prostitutes, publicans and fishermen. Cripes, he even provided the booze for one shindig.
I think that once he got over the shock of seeing what had been done in his memory he'd party on with the rest of us.
Not sure what he'd make of all that Christmas ham, though.
I think he'd be shocked, especially once he learned how many have died in his name. And that includes those killed in the name of Islam as he is the Greatest prophet in Islam.
I think he'd have a nervous breakdown
(Sorry Jesus)
"Christmas? That's not in the bible. That's not even my birthday it's my nemesis' birthday aka Ba'al/Nimrod/Saturn."
"Wow, do I love celebrations!!! Great job guys, but let's tighten it up a little in the future."