I've seen a few people say that the government should never impose any religious laws. I disagree.
There are good religious laws, such as "do not commit murder", "do not steal" and "do not lie in a courtroom". Those are in the Ten Commandments, in the Bible. It doesn't matter that they have a religious source; those are good laws to have and enforce. "Do not rape" and "do not break binding agreements"
I would also argue that it's impractical to only have non-religious laws, simply because the scope of religion and belief is so broad. Atheism, humanism and environmentalism are considered to be religions by some people. So anything coming from those mindsets falls under the category of "religious beliefs", too. If you're going to rule out all laws made by theists and atheists by default, you're not going to have a whole lot of lawmakers to choose from.
To give a more traditional Catholic response, it's impossible to have laws that are independent from religion, because all laws refer to justice, and all justice flows from God. Since God is the source and foundation of law, all laws refer back to him. Hence, we can claim that "an unjust law is no law at all"; God's justice is a precondition for the existence of proper law. Further, Jesus Christ is also directly tied to law and justice; he is referred to as the Eternal Judge or the Just One, "who will judge the living and the dead".
To sum up, I think the government should impose good laws, just laws. Any true lover of justice is not going to reject a law, simply because it has a religious origin.