I wouldn't tell her you're an atheist. Just tell her you don't really think much about religious stuff, and you don't want to be the member of a church because you find "other" religious people annoying.
It's a funny thing. To X-tians "I'm not really religious, and I don't really want to be" is not the same as "I'm an atheist." Sometimes just picking the right words will help your cause a lot.
It's a funny thing. To X-tians "I'm not really religious, and I don't really want to be" is not the same as "I'm an atheist." Sometimes just picking the right words will help your cause a lot.