A Roman Catholic Bishop in Peoria, Illinois used his homily time to compare President Obama to Hitler, Stalin and Otto Von Bismark. The Director of the Southern Baptist Convention's Ethic and Religious Liberty Commission accused President Obama of the using the Trayvon Martin killing for racial and political reasoons, then admitted he plagarized his comments from a little followed Washington newspaper.
I still think the best information out there on religious liberty (and freedom of speech in general) is William Lee Miller's The First Freedom. I have recommended it more than once on this site. Dr. Miller takes his readers through the intention of our founders in the matter of freedom of religion, as well as separation of Church and state.
The Bishop and the Baptist preacher mentioned in my first paragraph could gain much from a careful read of Dr. Miller's thoughtful little book.
Opinions expressed here are mine alone.