On any given fall Friday night, you’d be hard-pressed to find a football field in the South without a bowed head or a bent knee. But even before the season begins in a few weeks, the issue of prayer on public high school fields was put in the spotlight last week when a humanist group accused Chestatee High School of “unconstitutional infusion of religion into the high school football program.” In its letter to the school, the Appignani Humanist Legal Center, the legal arm of the American Humanist Association, wrote that coaches are leading and participating in prayers and that Bible verses are printed on workout sheets and cheerleading banners.