There are no atheists allowed in Catholic schools.
A teacher at a Catholic HS in Iowa was fired because she answered a poll about personal beliefs in a way her employer didn't like. Apparently, Abby Nurre was surfing around Facebook last summer (before she started her job at the Catholic school) and decided to answer a poll question she found. The poll asked whether she believed in God, angels or miracles - she answered "no".
Now she's out of a job because, as the school board put it, she violated "a policy that prohibits employees from advocating principles contrary to the dogmatic and moral teaching of the church."
That's a rather low threshold they've got — clicking on a poll is now "advocating"? I wonder if pharyngulating is a venial or a mortal sin…