HARRISBURG, Pa. - In one of the biggest courtroom clashes between faith and evolution since the 1925 Scopes Monkey Trial, a federal judge barred a Pennsylvania public school district Tuesday from teaching "intelligent design" in biology class, saying the concept is creationism in disguise.

U.S. District Judge John E. Jones delivered a stinging attack on the Dover Area School Board, saying its first-in-the-nation decision in October 2004 to insert intelligent design into the science curriculum violated the constitutional separation of church and state.

The ruling was a major setback to the intelligent design movement, which is also waging battles in Georgia and Kansas. Intelligent design holds that living organisms are so complex that they must have been created by some kind of higher force.