Legal marriage is entirely the responsibility of the state.
Many couples combine the two, but they are entirely distinct under our nation's constitutional separation of church and state. Ceremonial weddings are a social event and can be tailored to reflect religious and philosophical views. Legal marriage is a state-organized business which has very specific rules and procedures affecting over 170 rights and responsibilities. Our wills, powers of attorney and relationship agreements give us some say in the conduct of our personal affairs in the event of major life changes. And these documents can all be challenged by blood relatives.