I think you need to join them and go through a few of their rituals.
Regarding the divorce, don't forget that the Queen of Spain was a divorcee before she married Felipe. so it'll be worth talking to them.
Firstly in France you don't get married in church, you get married at the mairie (town hall), then go to the church for a blessing , So it doesn't matter what denomination you are to get married ,its where do you have the blessing :augie