Christianity and Politics

We as Christians should be able to refute unbiblical ideas about politics have you ever noticed how our government is quickly moving away from what the bible says. Meaning if you look at issues like gay marriage when they go to court its always about right to privacy. We know as Christians thats an abonimation and a sin againist God. We need to recognize this and be able to refute this as Christians. We know the truth now we just need to find a biblical way of presenting this to people. Its not just because its right its because when we are doing this its pointing people to the truth and to the miracles of Jesus Christ.