My grandparents are pretty religious, I also think they are kind of conservative, my grandma believes marriage is between man and woman, and my grandpa is a minister in the Uniting Church of Australia, so I don't know if I should tell them I am bi. They didn't react all that well to my happiness that America had legalised same sex marriage everywhere (by the way congrats on that), so I don't really know? Tell them or go back to Narnia?
Why do you want to tell them? Could you handle losing them? Evaluating the situation is probably the best way forwards.
I guess I want to tell them so that they aren't as surprised if I get a girlfriend, and I want to know if they will support me in the same way as if I had a boyfriend. I'm not sure if I could handle loosing them though, my grandpa favours me quite a bit, and I don't really want to loose that. If it comes up I'll probably muster up the courage to come out, or I'll just come out anyway when I get more courage, but otherwise I may just stay in the closet (it's quite warm and safe, and it's cold outside because it's winter in Australia)
If you can deal with not i would suggest it. I know it's hard. I'm out to almost no one but it's probably best