Every religious system has a code of morality. A "code of morality" and a "system of ethics" are exactly the same thing. Philosophically, a consistent ethical system is a necessary precursor to a cohesive system of politics. However, one does not need a religious moral code to form an ethical system. Such systems can (and have been) formed without religion. Thus, it is impossible to separate religion from politics. But it is possible to separated politics from religion.

The genius of the founding fathers, as Bill D points out, is that our political system recognizes the overriding morality of allowing for diversity in religious belief (including the right to opt out, if one chooses). The First Amendment begins "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; . . ." (Yes, the First Amendment).

One of many reasons the Constitution should never be used to try to enforce "moral behavior," such as a "definition of marriage" amendment, is inherent in the nature and purpose of the Constitution:

The difference between the Constitution and the Law is as follows—

The citizens are free to do anything they wish, unless it is specifically prohibited by Law.

The government is not allowed to do anything, unless it is specifically permitted by the Constitution.

Liberal churches tend to recognize this and see its value. Within my experience, conservative churches tend chafe under this kind of restriction.

Don Firth