I just finished The Mists of Avalon by Marion Zimmer Bradley. My friend read it years ago and loved it, and I always had it on my list of books to read, but it has literally taken me years to get to it. I found it at a used book sale recently and thought to myself, "This is a sign! Grab it, woman!"
It's the story of King Aurthur from the perspective of the women in his life, and details in large part (as a fictional story) the fall of druidism, fairie magic, and earth goddess worship in what is now Britian and Scotland to the Christian faith.
It's a facinating character study as each character represents different aspects of the same reasons religion is still so divisive today.
I enjoyed it, and clobbered it in about a week and a half. My favorite part was that when people are close to the earth goddess, and aware of her and appreciative and kind, magical and wonderful things happed, and there is a place for everyone in the world.