Wikipedia claims the X0 of this snowclone, “WWJD?” for “what would Jesus do?” became popular in the 1990s “as a personal motto for … Christians who used the phrase as a reminder of their belief that Jesus is the example to be followed in daily life, and to act in a manner of which Jesus would approve.” Subsequent Xs are intended as tongue-in-cheek role models, to contrast with Jesus, and include Brian Boitano, Patrick Swayze, Dumbledore, Snape, Xena, and Dubya.
The Jesus of the X0 phrase is also sometimes fixed, so that instances like “what would Jesus bomb?” are also acceptable.
The Snowclones Database 