"We want to show that atheists can have fun," said August Berkshire, president of Minnesota Atheists, which is sponsoring the event with American Atheists a day before its regional conference in downtown St. Paul.
"We picked the name not as a political statement, but just as something that was fun," Berkshire said. "We thought everybody ain't got a belief in something so it was a word everybody could relate to. Obviously, we ain't got a belief in God."
One atheist blogger wondered if the seventh-inning stretch would include the singing of "Dog Bless America."
Saints General Manager Derek Sharrer told The Associated Press the team has "no intention of mocking or making fun of anyone's faith."
The Saints have hosted several religiously themed events before, including Christian concerts and a Jewish Heritage Night. It would be "hypocritical," Sharrer said, to tell the atheists no.
The team, which is partly owned by actor Bill Murray, has a history of unusual promotions and events. The team's mascots are two pigs named Kim Lardashian and Kris Hamphries who carry baseballs to the umpires.
Nor is this the Saints' first dip into the religion and science debate. In 2010, the team gave away a rotating Cro-Magnon/Charles Darwin bobblehead doll to salute the 150th anniversary of the publication of Darwin's Origin of Species.