Why? Because I think religion is BS. They can do what the hell they want. I don't have this urge to make everyone think like I do. We can argue how if it is a sin it's no more grave a sin than adultery and churches aren't supposed to be only accepting the perfect, quite the opposite...But a secular society is about leaving each other alone, not forcing everyone and everything to abide by you. The CofE will catch up in time, bullying them into doing so just give powerful ammunition to nutters on the Right.