Here we have Newt Gingrich blathering on about marriage:
GINGRICH: It’s pretty simple: marriage is between a man and a woman. This is a historic doctrine driven deep into the Bible, both in the Old Testament and in the New Testament, and it’s a perfect example of what I mean by the rise of paganism. The effort to create alternatives to marriage between a man and a woman are perfectly natural pagan behaviors, but they are a fundamental violation of our civilization.
If “one man one woman only” marriage has historical roots driven deep into the bible (it doesn’t, more like one man to many women and slaves, but whatever), then it is a fundamentally religious notion.
When the government limits marriage to “one man one woman only” it infringes upon the free exercise of religion of people who believe same-sex couples should be allowed to marry.
This is exactly what the First Amendment set out to prevent:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
Thanks for making our case for us. That marriage is religious and therefore restrictions on it serve no secular purpose is a great argument in favor of removing those restrictions.