Secular values have steadily gained ground in America. That applies to divorce just as well as it does to abortion, drug use, disrespect for law and order, intemperate speech, dirty politics, and more in that vein.
The more that traditional values are 'dissed'--and that trend be enshrined in law as well--American Christians are swept along with it more often than should be the case.
Still in all, where does the still-existing opposition to immorality come from if not from the Christian community? It doesn't come from the news media. It doesn't come from Hollywood. It doesn't come from the Universities. It doesn't come from Congress. No, it comes from the Christian churches and organizations, and they've paid a high price for holding the line to the extent that they have been able.