I think that's actually a huge part of it. Roman Catholics and Greek Orthodox consider marriage a sacrement, and most other denominations consider marriage sacred. I could see how they would balk at the idea of something considered a command by God to be desecrated by people claiming it's not what it is to them. It would be like claiming to have Eucharist when you eat corn flakes. It's not cool, because Eucharist is a sacrement, you don't mess with that.
Personally, I figure I have a say over people who practice MY religion, and I can say that's against my denomination's understanding. But outside of that, it's you and your priest, I don't get a vote.
I think that's actually a huge part of it. Roman Catholics and Greek Orthodox consider marriage a sacrement, and most other denominations consider marriage sacred. I could see how they would balk at the idea of something considered a command by God to be desecrated by people claiming it's not what it is to them. It would be like claiming to have Eucharist when you eat corn flakes. It's not cool, because Eucharist is a sacrement, you don't mess with that.
Personally, I figure I have a say over people who practice MY religion, and I can say that's against my denomination's understanding. But outside of that, it's you and your priest, I don't get a vote.