I've heard that Marilyn Manson is really Josh Savino (or Paul Pfieffer); is that true?

In a word, no. There's no trurth at all to this most persistant rumor. It appears to have started as a one-;ine on-air joke by a DJ in the Pacific Northwest, and has since spread around the world. For more completely untrue things about the band check out the Rumor Mill.