"Render therefore unto Caesar the things which are Caesar's; and unto God the things that are God's." - Matthew 22:21
Now, I'm not religious - in fact, I'm a pretty passionate atheist - but I was raised Christian, and there are a lot of Christians in a lot of positions of power in this country, and it helps to know your enemy. Intriguingly, this oft-ignored passage is evidence that no less than Jesus Christ himself was a proponent of the separation of church and state. (But no less than the Mahatma Ghandi has pointed out the difference between Jesus Christ and modern Christians - here, also, is an excellent comic on that same subject).
Another way I like to interpret this passage is as a criticism of the common trend in America towards legislating morality. If you engage in immoral acts, that's something you should have to take up with your God. The state has no business punishing you for it. So when, for example, you rape, murder, or steal from someone, you are infringing on another person's basic rights, and that's where the police and the justice system should step in. But if you choose to watch porn, hire a prostitute, smoke dope, or anything like that, where the only "crime" is against the purity of your immortal "soul", then that's between you and God or your pastor. None of that stuff belongs on the law books.
