I wasn't going to comment on the Christian Day and Charlie Sheen weirdness as so many have done so already. I figure you can call yourself what you damn well please really.
(Since I practice witchcraft rather than act out warcraft, I think I will stick with witch over warlock. Or a magician depending on my mood.)
Still, after viewing the video of his Charlie Sheen binding ritual on youtube (Really Christian? Really?), my only comment is that I have a personal rule on ritual planning: A ritual should take longer to execute than it took to get dressed for it.