1 Would he have to appear on Oprah or the like? Which means he has to be a celeb first. How would he become a celeb?
2 Would he have to do tricks like change water into wine? Which means the likes of David Copperfield, Siegfried and Roy etc. are candidates?
3 Would you believe a "miracle" on TV anyway?
4 Are we too sceptical and information overloaded to believe anything any more?
5 Would anything possibly convince anyone in the 21st century anyhow?