The AU blog links to an earlier story from a local paper called "The Hook." The Hook [link] article has a quote from the Liberty Council (from when the school first made the decision to allow religious flyers).
"I think it would be unconstitutional to prohibit political material," says Liberty Counsel's Staver, who isn't worried about schools being inundated. "They're not required to accept everything," he says, citing exemptions for libelous, obscene or pornographic material. Nor does he object if Muslim or Jewish groups want to distribute information about their events in schools. "The First Amendment is not just for the Liberty Counsel," he says. "You can't just pick and choose."
Even nonprofits that often oppose Liberty Counsel-- for example, Planned Parenthood-- should be allowed to use the schools to get their messages out, Staver says. "You can't transport kids to an abortion clinic," he stipulates, "but you can send material home and let parents make a decision."
And if the Aryan Nation is having a family event? "You can always think of a hard example," concedes Staver. "I haven't seen the Aryan Nation come up with outreach to kids with picnics or lessons."
It doesn't read like they didn't imagine other religious groups would be sending home stuff because of their decision.
Their home page is one giant ode to how liberals and gays are destroying America
You're braver than I am, to look. I try to stay away from anything Falwellesque, or I end up sinning.