My parents are both atheists; however, they considered religion to be a useful subject to know, so we do have a Bible and some books on the history of Judaism. When I was little, I read a few stories from the Bible that were edited to be readable for children. My parents did say that belief in god is stupid, but my thoughts on religion were left up to me. I did explore various belief systems, adopted some, then rejected them -- as part of growing up. Atheism is associated with a more liberal mindset.
Among people I've known, it was often thought that one is born with religion. If your parents are Jewish, you must be Jewish and you must believe in god, naturally; if your parents are Christian, you are automatically Christian, even though you never attended Church or devoted a thought to the subject.