Gallup’s page on religion provides a number of studies and research reports on religion in the U.S. Contact through the website.
The Reference Desk’s Religion page provides resources on all types of religion.
The University of Wisconsin Data and Information Services Center is a research organization that provides educational resources on social sciences, including religion.
Britannica.com has a religions page that provides educational resources and information on religion.
The Center of Traditional Taoist Studies is a non-profit religious organization dedicated to promoting traditional Taoist studies.
Tenrikyo is a Tenrikyo Internet Committee maintained organization based in in Tenri, Japan that provides resources on the religion.
Do Not ZZZ is a multimedia, interactive and humorous introduction to Zen.
CaoDai’s U.S. website provides articles and educational resources on many aspects of the religion, including its history, its beliefs and practices and its core principles.
The World Religions & Spirituality Project at University of Virginia provides resources on religious beliefs and movements around the globe, including a list of links to other organizations who provide more detailed resources.