Under the Banner of Heaven by Jon Krakauer Anchor Books, paperback, $14.95, 375 pages, ISBN 1-4000-3280-6 What’s the scariest thing you can think of?  Financial collapse?  World-wide pandemic?  Street crime?  A giant asteroid hitting the Earth? Nuclear war?  All of those things are frightening as hell, but for me personally, the scariest thing we face in the world today . . . is religious fundamentalism. Religious fundamentalists are scary