Instapundit, as usual, puts the question in a nice bundle. I can't resist quoting some of his quotes, but follow the link above further the linked sources.
He quotes Michael Barone: "Fifty years ago, secular liberals were confident that education, urbanization and science would lead people to renounce religion. That seems to have happened, if you confine your gaze to Europe, Canada and American university faculty clubs."
And Jon Henke: "You can tell the Social Conservatives are losing by the very battles they are fighting. Almost without exception, they are doing rear-guard duty. I mean, we've got partial nudity on prime-time television, and gay marriage on the radar. That's one hell of a long way from the 1940s-50s, where even married TV characters had separate beds, and the question was not whether homosexuals deserved marriage, but whether they deserved a lobotomy."