This movie is NOT anti-creationist.
William Jennings Brian (Matthew Harrison Brady) Is not the villain for being creationist. Clarence Darrow (Drummond) admires Brady for standing up for what he believes in. The criticism isn't not believing in evolution, the criticism is for insisting that only one idea is right and any other idea isn't allowed to be discussed. It's like Drummond tells Mencken (Hornbeck), "Matthew Brady had the same right as Bert Cates- the right to be wrong."
The real villain is Hornbeck, because he doesn't have anything to stand up for, he only has contempt for idealism of any kind.
'Normal' is a term invented by the majority as an excuse for making fun of the minority.