I don't think that's what its saying. I think its saying that conflating the Bible with politics is the problem. Even Dr. Paul doesn't mix the two of them up. One is the law and the other is spiritual. Even when they tried to entrap him with those questions he referred to the Constitution because the Bible is not the law of the land. Christians within the GOP seem to eschew the Constitution preferring instead to take their marching order from the Bible. This is how we've gotten the wars, etc.
Anyway, that's my take on the point being made in the OP.