Peter Tatchell is reported as saying that no-one is insisting that churches, etc, be obliged to marry people in their church but I see no essential difference between that and the bed-and-breakfast case where the owners refused a room to a gay couple. So it seems likely that if this law goes through within relatively short time a gay couple will insist on being married in a church. I fear that could be a major socially divisive move that does great harm to both sides.

On the wider point I'm certainly in favour of allowing gays to marry and even more in favour of allowing straight couples to have a civil partnership if they so wish. (I'd also like to see weddings be the tens-of-thousands hoo-hah with all the intensive market pressures that they are now so that we could use civil partnerships being legally equivalent but without all the expectation of that excessive spending, but I don't see that happening somehow)