Our religion points us towards what is right and moral. Nothing God has says is immoral does not have a practical application that shows why it is wrong in society though. Thus I know that anything that God has told us is immoral is also bad for society. Whether that is homosexual marriage, contraception, or abortion I know that it will have a negative impact on society. If I move to make something illegal or to make sure its not promoted as something good, I’m not doing it just because God said so, I’m doing it because it is bad for society.
That said, we then have to debate what is the role of the government and how far it is allowed to go in the name of protecting society and promoting the common good. For one though we could never agree with a law or policy that promoted something we knew to be intrinsically evil. At minimum we should work to make it so that the government is never promoting something intrinsically evil and calling it good. Once again we do this not because of what our religion teaches, but because we know it to be harmful to society and do not wish it to be promoted as something good.
Depending on what a person believes the role of government should be in our lives, that will then advise them as to how much power the government should have to promote the general good of the population. Should the government be allowed to tell us what to eat, in the name of our health? Can the government require us to buy something in the name of the common good? How far reaching should the right to privacy extend? What kinds of relationships should the government promote? The answers to these kinds of questions are what inform a person how far they believe the government should be allowed to go in the name of protecting society.