RELIGION AND SEX The Immoral Majority: Finding sexual ethics in the godless masses - Don Lattin Our nation's self-anointed arbiters of public morality love to point their fingers at San Francisco and "the '60s." And many of us have gotten all too comfortable in this role as the hedonists and heretics of an otherwise God- fearing nation. OK, we're not perfect, and neither were those wild times, but can't the pundits of piety find another decade to bash and a new city to trash? According to some evangelical observers, the youth of America came here in the '60s with flowers in their hair and lust in their heart. Infected with the sins of the flesh and the wisdom of the East, they went forth across the land to spawn the first "post-Christian generation." But don't worry. True believers across the Bible Belt are praying for the poor lost souls of all those "unchurched'' twentysomethings and thirtysomethings born in the late '60s ...