The question is, how do they find out what you are?
Do they ask you? Would be pretty rediculous.
"Do you believe in God?"
"My beliefs are my own"
"Answer the question"
"I did"
etc.
If an atheist keeps his beliefs to himself, then sure, go into office. But that's a little difficult, considering every person seems to have a nack for spouting off what they believe and why you should too. Therefore I don't believe anyone is qualified to hold office.
-SW