It seems only fitting that comic Sarah Silverman has had guest roles on both the vampy \”V.I.P.\” and the geeky \”Star Trek: Voyager.\” She can trade on her good looks, which she milked in her Hollywood exec role on the Fox sitcom \”Greg the Bunny.\” But left to her own devices, Silverman, tomboyishly comfortable in jeans and sneakers, comes across like your dorky, smart-mouthed sister. Silverman will wield her scalpel-sharp wit in her show, \”Jesus Is Magic,\” Nov. 6-16 at the Canon Theater.\n\n\”It\’s very racial and it\’s sexual,\” Silverman, 31, told The Journal about \”Magic.\” \”I talk a lot about race, about Sept. 11, the Holocaust. I say a lot of stuff I don\’t mean.\”\n\n