If Jesus had not been born 2000 years ago and rejected by the people of the age, and if He suddenly came today, bringing a message of peace and anti-materialism and giving of one's wealth and time to care for our neighbors and performing mysterious miracles and decrying the TV evangelists and moneychangers, we would kill him too. I'm quite sure of it. So we share the guilt, and we share the reward.
I doubt seriously that we would kill Him today, He would, at the most, probably get a tv show, otherwise, He would be rejected a a kook. Who would instigate this killing, what countries would agree on it? Capital punishment is not even legal in most countries. When was the last time the entire world agrred on an execution?