Betty White is a Vegan. She is apparently an informal adherent of the religion known as Ethical Veganism. Veganism is not a religion for all self-described Vegans, and it is possible that White is a lifestyle-only vegan. However, her statements and her work in animal advocacy indicate that White's Veganism has a religious/philosophical component that goes beyond mere diet and lifestyle.
From: "Betty White" page on NNDB.com website (http://www.nndb.com/people/887/000022821/; viewed 19 December 2005):
She continues to appear on TV, but White is perhaps better known now as an animals' advocate. She has served on the Greater Los Angeles Zoo Association Board since 1974. She is a vegan, and says, "All creatures must learn to coexist. That's why the brown bear and the field mouse can share their lives in harmony. Of course, they can't mate or the mice would explode."