Social liberal organization opposing the political activities of the religious right in the U.S. and advocating strict separation of church and state. Talking points and position papers on current legislation and events.
http://www.pfaw.org/pfaw/general/default.aspx?oid=111
The Ayn Rand Institute's views on separation, with quotes from the founding fathers of the US, and commentary on some related issues such as abortion and evolution.
http://religion.aynrand.org/