I would say the religious arguments are more based in fear than in the actual teachings, that they’re based upon stray texts that actually don’t mean what you think they mean, and that Jesus himself only said one thing about marriage, which is that you can’t divorce. And we live in a country were countless people are divorced and that doesn’t seem to threaten the religious liberty of Catholics, and it’s as fundamental an issue. So if Catholics can live with religious liberty with divorced people, they should be perfectly able to live with gay people, I mean, as married, as a civil marriage.
Sullivan hits the nail on the head, pointing out the hypocrisy of religious conservatives who cherry-pick the bible to oppose some things, while ignoring other parts.
The full answer is even better: