Marriage is a legal contract between people
Marriage is a legal contract between people. It should be allowed to be done between because it’s their own life and if they want to share everything legally, it should be their right. NO matter the gender or number of people in this agreement between themselves.
Church wedding on the other hand is a totally different thing that should be only controlled by the church. I’m 100% sure there will be churches that won’t allow these new weddings in their rooms, but there will definitely be those who will allow it.
Church and state should be totally separated and what people believe in their head is their own business, that should not affect others.