Fresh from a bruising federal court fight over the teaching of evolution, Georgia marched back into the culture wars last week when Gov. Sonny Perdue signed a bill allowing Bible classes in public high schools. An estimated 8 percent of the nation's schools offer some form of Bible study. But the Georgia law is the first to set statewide guidelines and earmark public dollars for a Bible course. Five other states are considering similar measures. Georgia's school board has until February 2007 to decide how the courses should be taught, and forces on both sides of the issue are bracing for a messy battle.