I like how it's not even if you're religious, but if you go to Church. For all she knew, you could have been Jewish.
It's always entertaining to see the reactions though. One roommate in college was Jahova's Witness. When he asked my religion and I told him atheist, he just said "Oh" and smiled nervously at me. He had no idea what to do
Back when facebook was relatively new, I made a group (remeraber when you could make groups? woooooow) titled "Atheists, Agnostics, and Other Such Godless Heathens". I had a girl message me one time saying that she had never met an atheist and wanted to meet one. I agreed and we met for lunch one day so that she could ask me questions about how I live my life, how I came to my decisions, etc. At the end of the lunch she said she was very surprised. Why? Because I seemed like a good person and she didn't think that was possible.