WHICH PART of "body politic" do you not understand?
You have no hesitation citing sources of value to you. You have no trouble valuing highly those documents, sources, principles which have brought your life meaning and guided your choices and behaviors. You are happy to integrate those into the whole of your life and certainly to guide your understanding of, discussion of and interaction with/in the body politic.
But you want to prevent Christians from doing the same. What a selfishly unnoble attitude and perspective that appears to be.