As a Catholic, I've been in Protestant/Evangelical worships and there as well to funerals and weddings.
"God, Guns and Gays: Religion and Politics in the US and Western Europe" is the title of a website, which provides access to the text of a paper by Pippa Norris and Ronald Ingelehart which was delivered at the Political Communication section of the American Political Science Association conference 'Fun, Faith and Futurama' on September 1, 2004 University of Chicago Illinois.
It uses data taken from the World Values Survey 1981-2001 to consider the continuing power of religious faith in American politics and to compare it with a comparative decline in European nations.
This very interesting (and in pdf format :wink: ) paper with even more interesting figures is to be found
HERE