She is a religious woman, and I could care less for politics and religion. She gave me a bible and I said thank you but really wanted to just say no thank you.
How often do you see your aunt? Could be because she may seem like a stranger to you, as Evan said. Does she know your views? Could be because you may not care about the same things she does but feel compelled to act like you do, or at the least show more respect to her than some one whose not family. Heck, could be a combination of both.
I see her every few weeks, I'm use to being around her. I just don't like the thought that she gave me bible when I don't like religion or politics. I would rather not go into the subjects. and I think she might ignore me or judge me for not liking "god" "God". and what not.
Because she's a family member, so you think you're supposed to be all buddy buddy, but you don't actually know her that well, so its naturally awkward.