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?
LOL, yes Jesus would probably get a TV show if He first came today. And interviews in Rolling Stone and Newsweek and the NY Times. And He would surely have millions of followers, every night at 9:00, and in person. But the end principle is the same, what had to be done for atonement would still be the same.