Family: My mom's a Catholic fundie, so she'll never know about it. It's better that way because she'd just give me a headache and I don't want to deal with that. My brothers know, they're cool about it - I never told them outright, but they figured it out with the stuff I bought and some of the books I had in my room.
Friends: Cool about it. We're all different when it comes to religion/spirituality and accept/respect each other just fine.