God vs. Satan cast out space creatures at the box office.

The demon thriller "Exorcist: The Beginning" debuted as the No. 1 weekend movie with $18.2 million, displacing "Alien vs. Predator," which tumbled from the top spot to No. 4 with $12.5 million, according to studio estimates Sunday.

"Without a Paddle," a comedy about three pals on a slapstick canoe trip in search of treasure, opened in second place with $13.7 million.

After two strong weeks in limited release, the shark tale "Open Water" expanded nationwide and came in at No. 5 with $11.75 million, lifting its domestic total to $14.8 million.

Another popular limited-release flick, Zach Braff's (search) romantic comedy "Garden State," also went into fairly wide release, taking the No. 10 spot with $3.2 million and pushing its total to $6.7 million.

"Exorcist: The Beginning," a prequel to the 1973 horror blockbuster "The Exorcist," stars Stellan Skarsgard (search) as the priest of the original movie in his first encounter with the devil in late 1940s Africa.

The prequel was more than three years in the making, running through several directors and cast changes.

Original star Liam Neeson (search) departed after director John Frankenheimer (search) dropped out. Skarsgard replaced Neeson and filmed the movie with director Paul Schrader (search), whose version was shelved by the producers as not scary enough.

Director Renny Harlin shot a second version, keeping Skarsgard but replacing other cast members and tweaking the story.

Harlin said Sunday that with the No. 1 debut, he felt as though a three-year curse on the movie had lifted.

"We had so much baggage from the fact that two movies were shot and so many things had happened along the way. It created in the press the kind of perception that this is a troubled production," Harlin said. "While really, the shooting of this version was extremely smooth."

Though trashed by critics, Harlin's movie had solid appeal for horror fans, who typically turn out in droves on opening weekend.

"You can always count on horror films to do well," said Paul Dergarabedian, president of box-office tracker Exhibitor Relations. "There's just this built-in audience base that loves this genre."

The movie could follow the pattern of "Alien vs. Predator," whose $12.5 million second weekend was down a steep 67 percent from its opening gross.

Like "Alien vs. Predator" revenues, receipts for "Exorcist" dropped sharply from Friday to Saturday, a sign of poor word of mouth from early viewers. Most new movies do more business on their first Saturday than they did on Friday.

"Without a Paddle," starring Seth Green, Matthew Lillard and Dax Shepard, played largely to the 21-and-younger crowd but surprisingly drew slightly more females than males. Distributor Paramount had expected the buddy comedy to score a mostly male audience.

The movie was another genre flick unaffected by its flogging from critics.

"Anytime you have sort of a lampoon comedy like this, this audience doesn't pay much attention to reviews," said Wayne Lewellen, Paramount head of distribution.

In limited release, actor Stephen Fry's directing debut on the Jazz-age satire "Bright Young Things" premiered strongly with $53,500 in three theaters. Based on Evelyn Waugh's novel "Vile Bodies," the film's ensemble cast includes Emily Mortimer, Dan Aykroyd, Jim Broadbent and Peter O'Toole.

Estimated ticket sales for Friday through Sunday at North American theaters, according to Exhibitor Relations Co. Inc. Final figures will be released Monday.

1. "Exorcist: The Beginning," $18.2 million.

2. "Without a Paddle," $13.7 million.

3. "Princess Diaries 2: Royal Engagement," $13.2 million.

4. "Alien vs. Predator," $12.5 million.

5. "Open Water," $11.75 million.

6. "Collateral," $10.5 million.

7. "The Bourne Supremacy," $6.6 million.

8. "The Manchurian Candidate," $4.2 million.

9. "The Village," $3.7 million.

10. "Garden State," $3.2 million.