I agree. My sister-in-law is an atheist and is extremely conservative. She believes that she only has so much time, so make the most of it and the govt either slows her down or tries to stop her. She is pretty hard nosed, but she'll help anyone who truly needs a hand, but not a handout. You would never know that she is an atheist unless you directly ask her. She says it serves no purpose to announce that she doesn't believe in god, except to allow someone to categorize her.
My other sister-in-law is extremely liberal and is Christian. She is an academic and thinks that centralized planning is the way to go.
The pair make for interesting family holidays.