Yes.
No, not at all.
Reformed Christians also view the Law of God as having a threefold use. The second use of the Law is to restrain evil, "Though the law cannot change the heart, it can to some extent inhibit lawlessness by its threats of judgement, especially when backed by a civil code that administers punishment for proven offenses (Deut. 13:6-11; 19:16-21; Rom. 13:3, 4). Thus it secures civil order, and serves to protect the righteous from the unjust."
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So, we believe God saves His people in community and the Law of God has a continued role in society. "God...has ordained civil magistrates to be under him, over the people, for his own glory and the public good; and to this end has armed them with the power of the sword, for defence and encouragement of them that do good, and for the punishment of evil doers."
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Christianity is truth! It is the revelation of God to mankind and therefore absolutely true even for those who do not believe, it's objectively true and therefore we are to based society in and on it. Scripture doesn't allow for religious pluralism or syncretism.
Religious pluralism and syncretism is an American (Enlightenment) idea and God is not an American.
Yours in the Lord,
jm