What are some of these 'Doctrines of Devils'? Here is a short list of a few that come to mind:
Theistic Evolution (Evolution period),
Vatican II (Catholics),
The Emerging Church (Purpose Drivenism),
Book of Mormon (Mormonism),
Pre-Tribulation Rapture,
Sodomy (Gay/Lesbian),
Abortion,
Wicca (Witchcraft),
Divorce,
Good works gets you to Heaven,
Etc . . .