"I'm sorry. I'm a Pagan. I have much better Gods (and Goddesses) to choose from than yours."
Proselytizers in North America are totally mystified how to approach anyone not already a Christian. None of their scripts work.
Singles site: Lady who clearly didn't bother to actually read my profile - she was looking for a "God fearing man". My response: "I'm a Pagan. I know many Gods (and Goddesses), and I don't choose to associate with any I would need to fear".