I'm very interested in someone and I feel like she is interested in me. I know she comes from a very strong/sheltered Christian upbringing, goes to church every week, went to a Christian college, and posts Bible verses/Christian related things on Instagram.

She doesn't know I'm an atheist. Only because religion hasn't really come up in conversations and I haven't had a reason to say it. I don't want to waste her time if she's looking for a full on Christian guy, but at the same time I really like her. I know it's bound to come up eventually but I don't know if I should do something about it.

Do I wait to tell her when it comes up, or be upfront about it?
Anyone have experience with this type of situation?