Shortly before he was to attend a screening in January of the documentary “Expelled: No Intelligence Allowed,” which is about alternatives to the theory of evolution, Roger Moore, a film critic for The Orlando Sentinel, learned that his invitation had been revoked by the film’s marketers.

“Well, you already invited me,” he recalled thinking at the time. “I’m going to go.”

So Mr. Moore traveled to a local megachurch and planted himself among a large group of pastors to watch the movie. In it, Ben Stein, the actor and economist (and regular contributor to The New York Times) interviews scientists and teachers who say that Darwinism gets too much emphasis in the classroom and that proponents of the theory of intelligent design are treated unfairly.

There were nondisclosure agreements to sign that day, but Mr. Moore did not, and proceeded to write perhaps the harshest review “Expelled” has received thus far. The film will open April 18, but has been screened several times privately for religious audiences. Mr. Moore deplored what he perceived as “loaded images, loaded rhetoric, few if any facts” and accused Mr. Stein of using a “Holocaust denier’s” tactics.

Which, of course, was exactly the reaction the moviemakers were hoping to avoid by keeping mainstream critics out.