In Britain today, there is a millionaire gay couple who are suing the Church of England because they want to have a wedding in a church. Is this about symbolism, acceptance or poking a finger in the eye of Christians?
Church weddings are a different thing than gay marriage, though. My personal opinion is that anyone who wants one should have one. But at the same time, churches have to have the right to discriminate on memberships and services. I don't think they should refuse gay marriages, but if they choose to do so, that is in fact their right.
Church Of England is its own special beast, and probably shouldn't be allowed to refuse gay weddings. Messy topic, but that's what you get for mixing church and state.