Read various articles on Marianne Williamson
Marianne Williamson is not a Christian, however she is listed here because of the influence she has over Christians who don't know better. If you are a Christian who has bought into the teachings of Marianne Williamson, please spend some time comparing what she teaches vs what the Bible teaches and check out what others have to say about her.
Williamson bases her teaching and writing on a set of books called A Course in Miracles, a self-study program of spiritual psychotherapy, based on universal spiritual themes.The book has been called everything from "New Age psychobabble",a Satanic seduction", to "The New Age Bible" see http://en.wikipedia.org/wiki/A_Course_in_Miracles
Marianne Williamson is another spiritual teacher that is heavily promoted by Oprah Winfrey
Article - 7 Characteristics of false Teachers -
Thomas Brooks (1608-1680)