When I was at Notre Dame studying under Joe Evans, Frank O'Malley, and others, there was a very lively debate about the distinction between natural law and revealed truth. Most of the philosophers of church and state expected that what was going to be advocated as the law of the land would be related to natural law. If you attempted to draw lines about certain general moral truths that were derivative of logic and reason, they would prove to be widely shared, and therefore suitable to be enacted into law on both the civic and religious sides.