When the school board in Odessa, the West Texas oil town, voted unanimously in April to add an elective Bible study course to the 2006 high school curriculum, some parents dropped to their knees in prayerful thanks that God would be returned to the classroom, while others assailed it as an effort to instill religious training in the public schools. Hundreds of miles away, leaders of the National Council on Bible Curriculum in Public Schools notched another victory. A religious advocacy group based in Greensboro, N.C., the council has been pressing a 12-year campaign to get school boards across the country to accept its Bible curriculum.