King Dork by Frank Portman

Tom Henderson is a typical American high school loser until he discovers his deceased father's copy of the Salinger classic. Soon Tom finds himself in the middle of several interlocking conspiracies and at least half a dozen mysteries involving dead people, naked people, fake people, ESP, blood, a secret code, guitars, monks, witchcraft, the Bible, girls, the Crusades, a devil head, and rock and roll. And it all looks like it's just the tip of a very odd iceberg of clues that may very well unravel the puzzle of his father's death and-oddly-reveal the secret to attracting semihot girls. Being in a band could possibly be the secret to the girl thing-but good luck finding a drummer who can count to four. (FIC PORTMAN)