That's not what the first amendment says. A lot of laws have inspiration in religion (and tradition)—people believe X, and so want laws that support X. But if X gets passed as a law, it's because people support X, not necessarily because it comes from a religion. What we're seeing with gay marriage is, people are studying the matter, and finding out that the only reasons against it are religion, and tradition. And those aren't sufficient. So laws against it are being overruled.
But that isn't to say that religion has (or should have) no influence, because it influences the believers, who then support laws & lawmakers. Nor is always it possible to separate the beliefs that someone holds for religious reasons, vs. beliefs they hold for other reasons. But it does mean that a law needs more than religious reasons to stay on the books. Thankfully, gay marriage seems to be one that is mostly held for religious reasons, so laws preventing it can be dismantled (versus, say, marijuana prohibition. It's more than just religion, so it's harder to dismantle).
But if all you take away is that people against gay marriage aren't driven by sociopathic malice, then that's still an improvement.
But that isn't to say that religion has (or should have) no influence, because it influences the believers, who then support laws & lawmakers. Nor is always it possible to separate the beliefs that someone holds for religious reasons, vs. beliefs they hold for other reasons. But it does mean that a law needs more than religious reasons to stay on the books. Thankfully, gay marriage seems to be one that is mostly held for religious reasons, so laws preventing it can be dismantled (versus, say, marijuana prohibition. It's more than just religion, so it's harder to dismantle).
But if all you take away is that people against gay marriage aren't driven by sociopathic malice, then that's still an improvement.